Fix #492 SimulcastConsumer cannot switch layers if initial tsReferenc… #4816

Job	Run time
ci (ubuntu-20.04, 18, gcc, g++, Release)	6m 45s
ci (ubuntu-20.04, 18, gcc, g++, Debug)	8m 22s
ci (ubuntu-22.04, 20, gcc, g++, Release)	6m 8s
ci (ubuntu-22.04, 20, gcc, g++, Debug)	7m 20s
ci (ubuntu-22.04, 22, gcc, g++, Release)	6m 5s
ci (ubuntu-22.04, 22, gcc, g++, Debug)	5m 16s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=address, Release)	8m 46s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=address, Debug)	6m 12s
ci (ubuntu-24.04, 22, clang, clang++, -Db_sanitize=undefined, Release)	9m 58s
ci (ubuntu-24.04, 22, clang, clang++, -Db_sanitize=undefined, Debug)	9m 45s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=thread, Release)	7m 19s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=thread, Debug)	6m 20s
ci (macos-13, 18, clang, clang++, Release)	13m 13s
ci (macos-13, 18, clang, clang++, Debug)	13m 20s
ci (macos-14, 20, clang, clang++, Release)	6m 25s
ci (macos-14, 20, clang, clang++, Debug)	4m 24s
ci (macos-15, 22, clang, clang++, Release)	4m 2s
ci (macos-15, 22, clang, clang++, Debug)	6m 8s
ci (windows-2022, 20, cl, cl, Release)	8m 58s
ci (windows-2022, 20, cl, cl, Debug)	7m 40s
ci (windows-2022, 22, cl, cl, Release)	9m 20s
ci (windows-2022, 22, cl, cl, Debug)	8m 21s
	2h 50m 7s

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