Fix encoding when looking for subtitles (missing qfu).

(cherry picked from commit d8e0025e)
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>

modules/gui/qt4/dialogs_provider.cpp

@@ -657,7 +657,7 @@ void DialogsProvider::loadSubtitlesFile()
 
     QStringList qsl = showSimpleOpen( qtr( "Open subtitles..." ),
                                       EXT_FILTER_SUBTITLE,
-                                      path );
+                                      qfu( path ) );
     free( path );
     foreach( const QString &qsFile, qsl )
     {