Bug fix and Optimization related changes to stereo_dft_generate_comfort_noise, MLD improvements

• EVS 26.444 BE test passes.
• decoder pytests:
  MLD scores:
  Original inputs: 562 failed, 374 skipped
  MLD > 10: 4
  MLD > 5 : 51
  MLD < 5 : 507
  +10dB inputs: 562 failed, 374 skipped
  MLD > 10: 87
  MLD > 5 : 177
  MLD < 5 : 298
  -10dB inputs: 562 failed, 374 skipped
  MLD > 10: 2
  MLD > 5 : 11
  MLD < 5 : 549
• 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