Capture/Replay: Don't assert when reading combined depth/stencil We can't actually read them back at the moment, so this needs a proper fix. In the meantime, the apps we are tracking don't need this value at the beginning of the trace. Test: Angry Birds 2 MEC Bug: angleproject:3662 Bug: angleproject:4688 Bug: b/157672184 Change-Id: I67190092bcce7080edc69714f1ca1194c37d54fb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2231802 Reviewed-by: Manh Nguyen <nguyenmh@google.com> Commit-Queue: Cody Northrop <cnorthrop@google.com>