Enable tests that are now passing

Bug: angleproject:6064
Change-Id: I22d7a41b3e11556c929e4701e0c6c339e3aa7b6b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2957950Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>