FrameCapture: Fix ignoring compare_trace_screenshots.py --log Bug: b/294882956 Change-Id: I1e281b058c2f09f0dca3ce76648e385a3b443f0a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6932071 Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Cody Northrop <cnorthrop@google.com>