remove duplicated FEC_encoding parameters

Basic info

• Float reference:
  • Encoder (float):
  • Decoder (float):
• Fixed point:
  • Encoder (fixed): a0051869
  • Decoder (fixed):

Bug description

With some minimal adjustment, the same code can be used to quantized the FEC parameter for both EVS and IVAS. Most of the cases, the modification is bit exact, sometimes encoded parameter vary slightly

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-xxxx