Enable fixed swiftshader tests Bug: b/159712754 Change-Id: I5dc26726072ddadc3104561606cd425755679a83 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2304173 Reviewed-by: Nicolas Capens <nicolascapens@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>