Display: remove redundant 'metal' ANGLE_DEFAULT_PLATFORM This one is already handled only a few lines before. Bug: angleproject:8285 Change-Id: Ib62ce6062551faf39360371c46a05f9cc4a70b07 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4749295 Auto-Submit: Steven Noonan <steven@uplinklabs.net> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>