Fix a bug of SBR muxing in HIERARCHICAL mode.
Fix a bug of SBR muxing in HIERARCHICAL mode.

SBR in HIERARCHICAL mode was signaled with base (downsampled) frequency.
This does not affect to muxer cli, because it never uses explicit signalling.

maki-rxrz/L-SMASH,canbal/l-smash,canbal/l-smash,l-smash/l-smash,mstorsjo/l-smash,l-smash/l-smash,dwbuiten/l-smash,silverfilain/L-SMASH,l-smash/l-smash,mstorsjo/l-smash,maki-rxrz/L-SMASH,dwbuiten/l-smash,silverfilain/L-SMASH,silverfilain/L-SMASH