This fixes a regression introduced by commit
dbd8c89e. When using ORM_BACKBUFFER,
off-screen surfaces may be loaded into WINED3D_LOCATION_DRAWABLE. They
shouldn't be flipped in that case.
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>