Fix inconsistent spacing and trailing commas in objects in remaining src/ files, so we can enable the comma-dangle and object-curly-spacing ESLint rules later on

http://eslint.org/docs/rules/comma-dangle
http://eslint.org/docs/rules/object-curly-spacing

Given that we currently have quite inconsistent object formatting, fixing this in *one* big patch probably wouldn't be feasible (since I cannot imagine anyone wanting to review that); hence I've opted to try and do this piecewise instead.

Please note: This patch was created automatically, using the ESLint `--fix` command line option. In a couple of places this caused lines to become too long, and I've fixed those manually; please refer to the interdiff below for the only hand-edits in this patch.

```diff
diff --git a/src/display/canvas.js b/src/display/canvas.js
index 5739f6f2..4216b2d2 100644
--- a/src/display/canvas.js
+++ b/src/display/canvas.js
@@ -2071,7 +2071,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
       var map = [];
       for (var i = 0, ii = positions.length; i < ii; i += 2) {
         map.push({ transform: [scaleX, 0, 0, scaleY, positions[i],
-                 positions[i + 1]], x: 0, y: 0, w: width, h: height, });
+                   positions[i + 1]], x: 0, y: 0, w: width, h: height, });
       }
       this.paintInlineImageXObjectGroup(imgData, map);
     },
diff --git a/src/display/svg.js b/src/display/svg.js
index 9eb05dfa..2aa21482 100644
--- a/src/display/svg.js
+++ b/src/display/svg.js
@@ -458,7 +458,11 @@ SVGGraphics = (function SVGGraphicsClosure() {

       for (var x = 0; x < fnArrayLen; x++) {
         var fnId = fnArray[x];
-        opList.push({ 'fnId': fnId, 'fn': REVOPS[fnId], 'args': argsArray[x], });
+        opList.push({
+          'fnId': fnId,
+          'fn': REVOPS[fnId],
+          'args': argsArray[x],
+        });
       }
       return opListToTree(opList);
     },
```

src/display/webgl.js

@@ -73,7 +73,7 @@ var WebGLUtils = (function WebGLUtilsClosure() {
     // The temporary canvas is used in the WebGL context.
     currentCanvas = document.createElement('canvas');
     currentGL = currentCanvas.getContext('webgl',
-      { premultipliedalpha: false });
+      { premultipliedalpha: false, });
   }
 
   var smaskVertexShaderCode = '\
@@ -432,7 +432,7 @@ var WebGLUtils = (function WebGLUtilsClosure() {
     },
     composeSMask,
     drawFigures,
-    clear: cleanup
+    clear: cleanup,
   };
 })();