Bug 720641 (toolbar): Styling tweaks for firefox

- Use &#160; (i.e. nbsp) in place of ' ' because <description> seems to
  remove them when they're next to <label>s

mozilla/gcli/ui/completer.html

@@ -4,6 +4,6 @@
     <label class="${member.className}">${member.string}</label>
   </loop>
   <label class="gcli-in-ontab">${tabText}</label>
-  <label class="gcli-in-todo" foreach="param in ${emptyParameters}"> [<label title="${param.description}" class="gcli-in-param">${param.name}</label>]</label>
+  <label class="gcli-in-todo" foreach="param in ${emptyParameters}">&#160;[<label title="${param.description}" class="gcli-in-param">${param.name}</label>]</label>
   <label class="gcli-in-closebrace" if="${unclosedJs}">}</label>
 </description>