vcl: fdo#39468 - remove useless German comment

Change-Id: I8ba5a05fa310de32311afe6d49fe26045dc63e95
Reviewed-on: https://gerrit.libreoffice.org/12341Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Tested-by: Chris Sherlock <chris.sherlock79@gmail.com>

vcl/source/window/window.cxx

@@ -1224,7 +1224,6 @@ void Window::drawFrameDev( const Point& rPt, const Point& rDevPt, const Size& rD
             return;
     }
 
-    // ClipRegion zuruecksetzen
     if ( rRegion.IsNull() )
         mpGraphics->ResetClipRegion();
     else