Fix for -10dB crash issue

[x] Fix for -10dB crash which was occuring
as st->hBWE_TD->mem_resamp_HB[0] was being
set to -nan in subsequent frames.
[x] Cause of this was while doing intermediate
float to fix for st->hBWE_TD buffers, the for
loop for st->hBWE_TD->state_lsyn_filt_dwn_shb_fx_32
was being run 1 extra time due to which it was
overwriting the 0th index of st->hBWE_TD->mem_resamp_HB