Task-Nr: QTCREATORBUG-1616

The divider line is now gray instead of black.

Reviewed-By: con

Reviewed-By: con

As discussed with nigel, this label doesnt really make sense.
It is confusing because you might thing you should click it
and tab widgets do not usually require labels to indicate that
you should press them.

thus fixing the exit warning:
"~QX11PixmapData(): QPixmap objects must be destroyed..."

Acked-by: con