mesa: fix restoring of texture attributes for msaa binding points
This fixes rendering in Unigine Tropics with MSAA enabled. Since the binding for MSAA does not get restored, we can't rely on the "defaults get restored below" logic in that case.
Fixes: 81e6f6ef (mesa: don't push/pop default texture attributes redundantly) Closes: #4558 (closed) Signed-off-by: Ilia Mirkin imirkin@alum.mit.edu