Vulkan: Remove the flipViewportY feature This was featurized as a workaround for Intel/Windows drivers that did not render flipped in comparison to GL per Vulkan spec. This issue has long since been fixed, and due to missing parentheses the feature was accidentally unconditionally true for a long time already. Bug: angleproject:4896 Change-Id: I1db55d298bd47df649ff1f03d287d0cfa7453ea7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2372632 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>