Changes for MLD improvements

[x] Improved precision of JBM interpolator
[x] Scaling issue fix for ltv -stereo at 24.4 kbps, 32kHz in, 32kHz out, DTX on, MONO out
[x] Fix for high mld observed in ism-plc

• EVS 26.444 BE test passes.
• decoder pytests:
  MLD scores:
  Original inputs: 562 failed, 374 skipped
  MLD > 10: 2
  MLD > 5 : 16
  MLD < 5 : 544
  +10dB inputs: 562 failed, 374 skipped
  MLD > 10: 38
  MLD > 5 : 100
  MLD < 5 : 424
  -10dB inputs: 562 failed, 374 skipped
  MLD > 10: 0
  MLD > 5 : 6
  MLD < 5 : 556
• 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