Harmonise duplication of Comp_and_apply_gain_fx()

Basic info

• Float reference:
  • Encoder (float):
  • Decoder (float):
• Fixed point:
  • Encoder (fixed): 2b2acfdb
  • Decoder (fixed):

Bug description

There are 2 functions Comp_and_apply_gain_fx() and Comp_and_apply_gain_IVAS_fx() (related to the GSC ACELP coding) that do basically the same, except that the IVAS version truncates the excitation vector before performing a final upscaling based on the minimum value of the truncated vector. The EVS version used a maybe less optimal final scaling value, but it doesn't truncate. For the vast majority of cases, the EVS version will be more precise.

Ways to reproduce

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