remove obsolete code in FD BWE for DFT stereo (port from float)

fotopoulourequested to merge
float-1546-dft-stereo-dead-code into main

Closes ivas-codec-pc/ivas-codec#1546 (closed)

Reason why this change is needed

  • For DFT stereo modes, buffer new_input_hp_fx in function swb_bwe_enc_fx() is written twice

Description of the change

  • In the DFT-stereo block remove updating of the buffer

Affected operating points

  • Change is BE and does not affect any modes
Edited by fotopoulou

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