A previous CL had a copy-and-paste error in hasCopyImageView().  It
was calling getFetchImageView().valid() instead of
getCopyImageView().valid().

Bug: b/161993151
Change-Id: I40335ad51585735e9d68781557693ede67096e7d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2422085Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Ian Elliott <ianelliott@google.com>
Commit-Queue: Ian Elliott <ianelliott@google.com>