Fix rendering of reflection for transparent geoms.
Fix rendering of reflection for transparent geoms.

PiperOrigin-RevId: 462589429
Change-Id: Ibda2d2b83cb43804644fecfe3a1e2a8496f3de56

deepmind/mujoco,deepmind/mujoco,deepmind/mujoco,deepmind/mujoco,deepmind/mujoco