Re-enable atomic counter tests on !windows There is a bug that prevents us from running these tests on the windows bots. This change enables them on other platforms so we don't lose coverage. Bug: angleproject:3738 Change-Id: I9b546c3223499af88b347f8a01be8edb245c19a7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1950654 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>