We don't need to use upper case. Lower case can be more readable.

Skip a test on Linux/NV/Vulkan that became flaky after changing
the test order.

Bug: angleproject:3393
Change-Id: Ie027e08ddc9d47b9484cf5b1aaca72a05dd60517
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1574676
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>