Function ivas_encode_masaism_metadata_fx has wrong accumulation and suboptimal porting

Basic info

• Float reference:
  • Encoder (float): 69d52e95006f4fd8f4a75874acaeee89928f8531
  • Decoder (float):
• Fixed point:
  • Encoder (fixed): 26ae1a66
  • Decoder (fixed):

Bug description

Inspecting the OMASA-related encoding function ivas_encode_masaism_metadata_fx, there is at least one copy-paste error causing one path to produce wrong ratios. Also overall, the usage of temporary variables is not always logical.