Remove deprecated flags from compare_videos.py.
Remove deprecated flags from compare_videos.py.

Bug: None
Change-Id: If581ce5b949dab8143b35ad4cbfb7fadf6f4c83e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/143788
Reviewed-by: Magnus Jedvert <9507adee858471ab168c339dc72b814b168c081b@webrtc.org>
Commit-Queue: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28377}

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