Fix: Only flip video once for BottomToTop scanline directions
Fix: Only flip video once for BottomToTop scanline directions

Top & bottom of the texture coordinates are already flipped for BottomToTop scanline directions.
So there is no need to flip top & bottom of the vertex coordinates too.

Change-Id: I221b94afb65c194bdedb787414e6a436b8095fb2
Reviewed-by: Thomas McGuire <2a8c2e178f359344f9cfed0db24d661e86eba971@kdab.com>
Reviewed-by: Dmytro Poplavskiy <72e04cfb587e72184d425a79cb5cea0021f0b982@gmail.com>

sergiusens/qtmultimedia,sergiusens/qtmultimedia,jfaust/qtmultimedia,mer-qt/qtmultimedia,nezticle/qtmultimedia,mer-qt/qtmultimedia,webOS-ports/qtmultimedia,mer-qt/qtmultimedia,nezticle/qtmultimedia,jfaust/qtmultimedia,webOS-ports/qtmultimedia,jfaust/qtmultimedia,webOS-ports/qtmultimedia,jfaust/qtmultimedia,nezticle/qtmultimedia,nezticle/qtmultimedia,webOS-ports/qtmultimedia,sergiusens/qtmultimedia,webOS-ports/qtmultimedia,mer-qt/qtmultimedia,sergiusens/qtmultimedia,jfaust/qtmultimedia,nezticle/qtmultimedia,sergiusens/qtmultimedia,mer-qt/qtmultimedia