Fix some issues for QProgressBar with fusion style:
- no progress text was shown in vertical mode
- the color change for the text was not correct in rtl mode
- the two rounded rects were not drawn correctly in some modes
Also simplify the code by also using a QTransform for rtl mode and not
only for the vertical mode.
Fixes: QTBUG-117904
Change-Id: I1dd89daf34e8808417750f2ca714252afdab1416
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>