Update Export dialog screenshots to match changes since the last revision

include/export-dialog.html

@@ -8,7 +8,7 @@
 </p>
 
 <figure class="right">
-  <img src="/images/export-dialog-file-format.png" alt="The Export window">
+  <img width="50%" src="/images/export-dialog-file-format.png" alt="The Export window">
   <figcaption>
     The Export window
   </figcaption>
@@ -93,7 +93,7 @@
 <h2>Analyze exported audio</h2>
 
 <figure>
-  <img src="/images/export-report-analysis.png" alt="The Export Report/Analysis window">
+  <img width="50%" src="/images/export-report-analysis.png" alt="The Export Report/Analysis window">
   <figcaption>
     The Export Report/Analysis window
   </figcaption>
@@ -131,7 +131,7 @@
 <h2>Time Span</h2>
 
 <figure>
-  <img src="/images/export-dialog-timespan.png" alt="The Time Span tab">
+  <img width="50%" src="/images/export-dialog-timespan.png" alt="The Time Span tab">
   <figcaption>
     The Time Span tab
   </figcaption>
@@ -153,7 +153,7 @@
 <h2>Channels</h2>
 
 <figure>
-  <img src="/images/export-dialog-channels.png" alt="The Channels tab">
+  <img width="50%" src="/images/export-dialog-channels.png" alt="The Channels tab">
   <figcaption>
     The Channels tab
   </figcaption>