Fix extra scrollbar on viewer

  - Set display: block on <embed> to keep the enclosing <div> from
    taking up space
  - Don't reappend listener <div>. It's already where it should be.

Author: pbrant

web/viewer.js

@@ -1468,6 +1468,7 @@ function webViewerInitialized() {
 
   if (imageStreamDecoderListener) {
     var moduleEl = document.createElement('embed');
+    moduleEl.setAttribute('style', 'display: block;');
     moduleEl.setAttribute('width', 0);
     moduleEl.setAttribute('height', 0);
     moduleEl.setAttribute('path', 'image_stream_decoder');
@@ -1493,8 +1494,6 @@ function webViewerInitialized() {
     listenerEl.addEventListener('error', disableImageStreamDecoder('error'), true);
     listenerEl.addEventListener('crash', disableImageStreamDecoder('crash'), true);
     listenerEl.appendChild(moduleEl);
-
-    document.body.appendChild(listenerEl);
   }
 
 //#if !(FIREFOX || MOZCENTRAL)