Vulkan: Fix Overlay for prerotation Bug: angleproject:5690 Change-Id: I906a259767c54e3ac9f3ac822b6d5ed5dcaa0bd5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2725768 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Ian Elliott <ianelliott@google.com>