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[Non BE] Add FIX_499_DFT_STEREO_PLC: wrong memory addressed in DFT stereo residual PLC

norvellrequested to merge
499-click-in-stereo-coded-at-32-kbps-48-khz-and-processed-by-fer-5 into main

There is a bug causing the issue in #499 (closed). The PLC for the DFT stereo residual relies on the energy of the past down-mix. When calculating the energy in hStereoDft->past_dmx_nrg the memory pointers are incorrectly advanced and do not point to the previous DFT subframes. In the case in #499 (closed), the wrongly addressed subframes happen to be zero (unused) at the time of the bad frame, which leads to a division by zero in the gain adjustment calculation. The fix FIX_499_DFT_STEREO_PLC correct the pointer addressing to the previous two subframes.

Affects BE of DFT Stereo frame error conditions, since the correct frames are now used in the energy calculation.

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