BUG 1303719 resize tagfetcher dialog correctly

@jus can you check if this also fixed the issue on mac

https://bugs.launchpad.net/bugs/1303719
This seems to be an issue how QDesigner creates layouts with seperated
QWidgets for me. For Qt to pick up resizing hints correctly the *.ui xml
should look like this.

<widget ...>
 <layout ...>
  <item>
   ...
  </item>
  <item>
   ...
  </item>
 </layout>
</widget>

and for documentation reasons here is the non working version

<widget ...>
 <widget class="QWidget" name="somelayout">
  <layout ...>
   <item>
    ...
   </item>
   <item>
    ...
   </item>
  </layout>
 </widget>
</widget>