WebSockets: minor update in JS code style

Use anonymous blocks { } instead of anonymous functions as the outermost scope
in some files.

Also fix incorrect wording for a comment

share/web_surfaces/builtin/mixer/js/main.js

@@ -22,8 +22,8 @@ import { createRootContainer, Container, Dialog, Label, Button, Toggle,
             AudioStripGainFader, MidiStripGainFader,
             AudioStripMeter, MidiStripMeter  } from './tkwidget.js';
 
-(() => {
-    
+{
+
     const ardour = new ArdourClient();
 
     async function main () {
@@ -223,4 +223,4 @@ import { createRootContainer, Container, Dialog, Label, Button, Toggle,
 
     main();
 
-})();
+}

share/web_surfaces/builtin/mixer/js/tkwidget.js

@@ -167,7 +167,7 @@ export class Dialog extends BaseDialog {
 
     show () {
         // opening a TK.Dialog with auto_close=true from a TK.Button callback 
-        // fails otherwise ev.stopPropagation() is called in the button event
+        // fails unless ev.stopPropagation() is called in the button event
         // handler or setTimeout() is used here
         setTimeout(() => {
             this.tk.set('display_state', 'show');

share/web_surfaces/builtin/protocol/main.js

@@ -18,7 +18,7 @@
 
 import ArdourClient from '/shared/ardour.js';
 
-(() => {
+{
 
     const MAX_LOG_LINES = 1000;
     
@@ -65,4 +65,4 @@ import ArdourClient from '/shared/ardour.js';
 
     main();
 
-})();
+}

share/web_surfaces/builtin/transport/main.js

@@ -18,7 +18,7 @@
 
 import ArdourClient from '/shared/ardour.js';
 
-(() => {
+{
 
     const dom = {
         main       : document.getElementById('main'),
@@ -126,4 +126,4 @@ import ArdourClient from '/shared/ardour.js';
 
     main();
 
-})();
+}

share/web_surfaces/index/main.js

@@ -18,7 +18,7 @@
 
 import ArdourClient from '/shared/ardour.js';
 
-(() => {
+{
 
     async function main () {
         try {
@@ -81,4 +81,4 @@ import ArdourClient from '/shared/ardour.js';
 
     main();
 
-})();
+}