Fixes for some high MLD cases

[x] ltv-MASA 2TC bitrate switching from 13.2 kbps to 512 kbps, 48kHz in, 48kHz out, MONO out - MLD reduced
[x] stv-OMASA 1Dir2TC 4ISM at br sw techs 13.2 to 512 kbps start 80kbps, 48kHz in, 48kHz out, HOA3 out - MLD reduced from 11.2 to 7.9

• EVS 26.444 BE test passes.
• decoder pytests:
  MLD scores:
  Original inputs: 562 failed, 374 skipped
  MLD > 10: 7
  MLD > 5 : 77
  MLD < 5 : 478
  +10dB inputs: 562 failed, 374 skipped
  MLD > 10: 103
  MLD > 5 : 180
  MLD < 5 : 279
  -10dB inputs: 562 failed, 374 skipped
  MLD > 10: 2
  MLD > 5 : 16
  MLD < 5 : 544
• encoder pytests results:
  MLD scores:
  Original inputs: 562 tests:
  MLD > 10: 18
  MLD > 5 : 71
  MLD < 5 : 473
  +10dB inputs: 562 tests:
  MLD > 10: 66
  MLD > 5 : 124
  MLD < 5 : 372
  -10dB inputs: 562 tests:
  MLD > 10: 5
  MLD > 5 : 30
  MLD < 5 : 527