Fix for high MLDs observed with LTV streams

[x] MLD Fix for LTV - MASA 2TC at 24.4 kbps, 48kHz in, 48kHz out, STEREO out
[x] Added missing scaling of st->hHQ_core->old_out_fx when st->Q_old_wtda is reset to 0

• EVS 26.444 BE test passes.
• decoder pytests:
  MLD scores:
  Original inputs: 562 failed, 374 skipped
  MLD > 10: 2
  MLD > 5 : 19
  MLD < 5 : 541
  +10dB inputs: 562 failed, 374 skipped
  MLD > 10: 38
  MLD > 5 : 121
  MLD < 5 : 403
  -10dB inputs: 562 failed, 374 skipped
  MLD > 10: 0
  MLD > 5 : 5
  MLD < 5 : 557
• encoder pytests results:
  MLD scores:
  Original inputs: 562 tests:
  MLD > 10: 18
  MLD > 5 : 67
  MLD < 5 : 477
  +10dB inputs: 562 tests:
  MLD > 10: 69
  MLD > 5 : 122
  MLD < 5 : 371
  -10dB inputs: 562 tests:
  MLD > 10: 5
  MLD > 5 : 24
  MLD < 5 : 533