Fixups to ANGLE_get_image boilerplate. - Remove level parameter from GetRenderbufferImage. - Add packed enum handling to GetTexImage. - Fix ext spec reference to table 8.4. Bug: angleproject:3944 Change-Id: I8f67608396217aaddb789dd95d0f3e2378ce918d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1879960 Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Tim Van Patten <timvp@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>