Bug in ITD estimation if input sampling rate is 48 kHz but -max_band is set to WB or SWB

There is a bug in the function calc_mean_E_ratio() in ivas_stereo_dft_enc_itd.c. The code

/*take bands up to 32kHz bandwidth as ITD is always calculated at 32kHz sampling rate*/
nbands -= ( NFFT > STEREO_DFT_N_32k_ENC );

only makes sense if nbands is set to the maximum number of bands in FB mode. However, if the bandwidth was limited via commandline parameter -max_band nbands is already configured correctly. Therefore, subtracting one more band is wrong and leads to different output of the function which can change the entire ITD estimate.