Remove skipping of groupMemoryBarrierAndBarrierTest on NVIDIA.

BUG=angleproject:2280

Change-Id: I9ea72939cd0f828295bb694c9d3515ef554c9a36
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1763948
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>