Vulkan: Disable 1xMSAA on integer formats too This was pending swiftshader support for 4xMSAA support for integer formats, which is long done. Bug: angleproject:4197 Change-Id: I843a9674e20a48b5387bd67b8c0efc8617841382 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2248198 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Ian Elliott <ianelliott@google.com>