Draft: lib: change all_layers default to 0

I deliberately omitted changing the default in https://code.videolan.org/tmatth/dav1d/-/blob/master/tools/dav1d_cli_parse.c?ref_type=heads#L85 as this breaks tests (maybe that warrants a separate issue/discussion?)

See: vlc#28776 (closed) for context

added 1 commit

• 99993529 - lib: change all_layers default to 0

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