Fix cards flashing a bit when resizing

We need to finish painting otherwise the card isn't painted and flashing
happens for a short moment

src/libkcardgame/kcard.cpp

@@ -321,10 +321,6 @@ void KCard::paint( QPainter * painter, const QStyleOptionGraphicsItem * option,
             setFrontPixmap( newPix );
         else
             setBackPixmap( newPix );
-
-        // Changing the pixmap will call update() and force a repaint, so we
-        // might as well return early.
-        return;
     }
 
     // Enable smooth pixmap transformation only if the card is rotated. We