Don't resize when you toggle playlist if undocked.

First, this is useless, then, it is stupid, and finally, it will resize your
video if your resized it by hand. (However, this reveals a bigger bug in the
 VideoWidget ) This is NOT critical, but this is not really good.

modules/gui/qt4/main_interface.cpp

@@ -765,7 +765,7 @@ void MainInterface::togglePlaylist()
     {
     /* toggle the visibility of the playlist */
        TOGGLEV( playlistWidget );
-       resize( sizeHint() );
+       //resize( sizeHint() );
        playlistVisible = !playlistVisible;
     }
 }