Correct mask of A2B10G10R10

Green mask is missing an F.

Change-Id: I7387ef01ee414abc1a48efec71d71f46922c1bed
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>