Fix frozen video in simulcast due to wrong dropping of padding only packets #4758

Job	Run time
ci (ubuntu-20.04, 18, Release)	6m 21s
ci (ubuntu-20.04, 18, Debug)	6m 5s
ci (ubuntu-22.04, 20, Release)	5m 47s
ci (ubuntu-22.04, 20, Debug)	5m 21s
ci (ubuntu-24.04, 20, -Db_sanitize=address, Release)	8m 38s
ci (ubuntu-24.04, 20, -Db_sanitize=address, Debug)	6m 23s
ci (ubuntu-24.04, 20, -Db_sanitize=undefined, Release)	9m 32s
ci (ubuntu-24.04, 20, -Db_sanitize=undefined, Debug)	6m 26s
ci (ubuntu-24.04, 20, -Db_sanitize=thread, Release)	7m 29s
ci (ubuntu-24.04, 20, -Db_sanitize=thread, Debug)	6m 22s
ci (macos-12, 18, Release)	7m 22s
ci (macos-12, 18, Debug)	7m 6s
ci (macos-14, 20, Release)	4m 4s
ci (macos-14, 20, Debug)	3m 40s
ci (windows-2022, 20, Release)	9m 32s
ci (windows-2022, 20, Debug)	7m 34s
	1h 47m 42s

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