Qt4: fix open dialog issue when file browser is embedded

Close #3893
(cherry picked from commit e2254d4cc2ad6e358bc707e60a88015de3af4a44)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/components/open_panels.cpp

@@ -229,7 +229,11 @@ void FileOpenPanel::updateMRL()
                 fileList << ui.fileListWidg->item( i )->text();
         }
     else
+    {
         fileList = dialogBox->selectedFiles();
+        for( int i = 0; i < fileList.count(); i++ )
+            fileList[i] = toNativeSeparators( fileList[i] );
+    }
 
     /* Options */
     if( ui.subCheckBox->isChecked() &&  !ui.subInput->text().isEmpty() ) {