Fix for some high MLD cases

[x] Bug fix made in decimate_all_pass_steep
[x] Signal scaling fixes in ivas_core_dec
[x] Q factor update in dirac_dec_binaural_functions.c

• EVS 26.444 BE test passes.
• decoder pytests:
  MLD scores:
  Original inputs: 562 failed, 374 skipped
  MLD > 10: 6
  MLD > 5 : 64
  MLD < 5 : 492
  +10dB inputs: 562 failed, 374 skipped
  MLD > 10: 98
  MLD > 5 : 184
  MLD < 5 : 286
  -10dB inputs: 562 failed, 374 skipped
  MLD > 10: 2
  MLD > 5 : 12
  MLD < 5 : 548
• 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