Skip ShaderStorageBufferTest31.ActiveSSBOButNotStaticallyUsed on Pixel 2 Vulkan. Bug: angleproject:3725 Change-Id: Ic5c80ad3ec495c3fd382639f761b368f16993434 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1713564 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Yuly Novikov <ynovikov@chromium.org>