Remove unused "opaque region base" from themes

gtk2_ardour/themes/blueberry_milk-ardour.colors

@@ -496,7 +496,6 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.4666"/>
     <Modifier name="midi track base" modifier="= alpha:0.3"/>
     <Modifier name="mono panner position fill" modifier="= alpha:0.8"/>
-    <Modifier name="opaque region base" modifier="= alpha:1.0"/>
     <Modifier name="panner fill" modifier="= alpha:0.7882"/>
     <Modifier name="piano roll black" modifier="= alpha:0.2"/>
     <Modifier name="piano roll white" modifier="= alpha:0.2"/>

gtk2_ardour/themes/caineville-ardour.colors

@@ -497,7 +497,6 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.4666"/>
     <Modifier name="midi track base" modifier="= alpha:0.3"/>
     <Modifier name="mono panner position fill" modifier="= alpha:0.8"/>
-    <Modifier name="opaque region base" modifier="= alpha:1.0"/>
     <Modifier name="panner fill" modifier="= alpha:0.7882"/>
     <Modifier name="piano roll black" modifier="= alpha:0.2"/>
     <Modifier name="piano roll white" modifier="= alpha:0.2"/>

gtk2_ardour/themes/clear_gray-ardour.colors

@@ -497,7 +497,6 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.4666"/>
     <Modifier name="midi track base" modifier="= alpha:0.3"/>
     <Modifier name="mono panner position fill" modifier="= alpha:0.8"/>
-    <Modifier name="opaque region base" modifier="= alpha:1.0"/>
     <Modifier name="panner fill" modifier="= alpha:0.7882"/>
     <Modifier name="piano roll black" modifier="= alpha:0.2"/>
     <Modifier name="piano roll white" modifier="= alpha:0.2"/>

gtk2_ardour/themes/cubasish-ardour.colors

@@ -497,7 +497,6 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.4666"/>
     <Modifier name="midi track base" modifier="= alpha:0.3"/>
     <Modifier name="mono panner position fill" modifier="= alpha:0.8"/>
-    <Modifier name="opaque region base" modifier="= alpha:1.0"/>
     <Modifier name="panner fill" modifier="= alpha:0.7882"/>
     <Modifier name="piano roll black" modifier="= alpha:0.2"/>
     <Modifier name="piano roll white" modifier="= alpha:0.2"/>

gtk2_ardour/themes/dark-ardour.colors

@@ -498,7 +498,6 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.4666"/>
     <Modifier name="midi track base" modifier="= alpha:0.3"/>
     <Modifier name="mono panner position fill" modifier="= alpha:0.8"/>
-    <Modifier name="opaque region base" modifier="= alpha:1.0"/>
     <Modifier name="panner fill" modifier="= alpha:0.7882"/>
     <Modifier name="piano roll black" modifier="= alpha:0.2"/>
     <Modifier name="piano roll white" modifier="= alpha:0.2"/>

gtk2_ardour/themes/diehard3-ardour.colors

@@ -498,7 +498,6 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.46660000000000001"/>
     <Modifier name="midi track base" modifier="= alpha:0.29999999999999999"/>
     <Modifier name="mono panner position fill" modifier="= alpha:0.80000000000000004"/>
-    <Modifier name="opaque region base" modifier="= alpha:1"/>
     <Modifier name="panner fill" modifier="= alpha:0.80032710280373831"/>
     <Modifier name="piano roll black" modifier="= alpha:0.20000000000000001"/>
     <Modifier name="piano roll white" modifier="= alpha:0.20000000000000001"/>

gtk2_ardour/themes/recbox-ardour.colors

@@ -498,7 +498,6 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.46660000000000001"/>
     <Modifier name="midi track base" modifier="= alpha:0.29999999999999999"/>
     <Modifier name="mono panner position fill" modifier="= alpha:0.80000000000000004"/>
-    <Modifier name="opaque region base" modifier="= alpha:1"/>
     <Modifier name="panner fill" modifier="= alpha:0.78820000000000001"/>
     <Modifier name="piano roll black" modifier="= alpha:0.20000000000000001"/>
     <Modifier name="piano roll white" modifier="= alpha:0.20000000000000001"/>

gtk2_ardour/themes/unastudia-ardour.colors

@@ -496,7 +496,6 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.4666"/>
     <Modifier name="midi track base" modifier="= alpha:0.3"/>
     <Modifier name="mono panner position fill" modifier="= alpha:0.8"/>
-    <Modifier name="opaque region base" modifier="= alpha:1.0"/>
     <Modifier name="panner fill" modifier="= alpha:0.7882"/>
     <Modifier name="piano roll black" modifier="= alpha:0.2"/>
     <Modifier name="piano roll white" modifier="= alpha:0.2"/>

gtk2_ardour/themes/xcolors-ardour.colors

@@ -497,7 +497,6 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.5"/>
     <Modifier name="midi track base" modifier="= alpha:0.3"/>
     <Modifier name="mono panner position fill" modifier="= alpha:0.8"/>
-    <Modifier name="opaque region base" modifier="= alpha:0.5"/>
     <Modifier name="panner fill" modifier="= alpha:0.8"/>
     <Modifier name="piano roll black" modifier="= alpha:0.2"/>
     <Modifier name="piano roll white" modifier="= alpha:0.2"/>