Launch list properties dialog on list element, b=114832, r=andreww, sr=kin, a=asa

editor/ui/composer/content/ComposerCommands.js

@@ -2242,6 +2242,7 @@ var nsObjectPropertiesCommand =
         case 'ol':
         case 'ul':
         case 'dl':
+        case 'li':
           goDoCommand("cmd_listProperties");
           break;
         case 'a':