Qt: undo the FSC/KDE workaround

This is a partial revert of the "fix" introduced in
ffe7367b1672ec72705ec4cb440758ec0c869230.

If you encounter a visual bug in the fullscreen controller and you are
using KDE, please upgrade to version 4.6.2 or don't use the Oxygen
theme.

Ref: https://bugs.kde.org/show_bug.cgi?id=254473Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 1de20d444feacdbda356ebc54d8492126444be06)
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

modules/gui/qt4/components/controller.cpp

@@ -649,12 +649,7 @@ FullscreenControllerWidget::FullscreenControllerWidget( intf_thread_t *_p_i, QWi
 
     vout.clear();
 
-#ifdef Q_WS_X11
-    setWindowFlags( Qt::Window | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint );
-    setWindowModality( Qt::ApplicationModal );
-#else
     setWindowFlags( Qt::ToolTip );
-#endif
     setMinimumWidth( 600 );
 
     setFrameShape( QFrame::StyledPanel );