plugins/backgroundcontrast: Correct texture transform
The y axis should be mirrored as the last step, otherwise it's going to change the winding order in rotation transforms in the render target transform.
(cherry picked from commit 6d0f1fed)
The y axis should be mirrored as the last step, otherwise it's going to change the winding order in rotation transforms in the render target transform.
(cherry picked from commit 6d0f1fed)