capture/replay: validate after resetting unpack alignment Otherwise validation will fail, because we try to validate the temporary set alignment against the alignment that would be active without MEC. Bug: angleproject:7564 Bug: angleproject:7180 Change-Id: I40cac84be122c779b9beba39f155567f9edbee75 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3936631 Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Gert Wollny <gert.wollny@collabora.com>