[characterization] BS1534-19: For conditions c07/c08, PCM at EVS_dec out mistakenly interpreted as Stereo

For experiment BS1534-19, the conditions c07/08 are wrong:

c07	CuT (dynamic dmx +EVS)	13.2
c08	CuT (dynamic dmx +EVS)	24.4

Apparently, the PCM output of EVS_dec is wrongly interpreted as Stereo:

The PCM file (e.g. tmp_c07/im19a1s01.ivas.pcm) is still OK, but the wav-file which is then input to IVAS_rend (tmp_c07/im19a1s01.ivas.pcm) is mistakenly already stereo, i.e. every second sample is interpreted as L or R, respectively.

A possible solution seems to be to add fmt: MONO to the dec:-section for c07 and c08, e.g.

    c07:
        type: ivas
        ivas_rend:
            fmt: STEREO
        bitrates:
            - 13200
        cod:
            bin: ivas_processing_scripts/bin/IVAS_cod_fx
            opts:
                - -stereo_dmx_evs
        dec:
            fmt: MONO
            bin: ivas_processing_scripts/bin/EVS_dec_fx