cherry-pick patch in NONBE_FIX_1376_MDCT_CONCEALMENT

#define NONBE_1244_FIX_SWB_BWE_MEMORY                   /* VA: issue 1244: fix to SWB BWE memory in case of switching from FB coding - pending a review by Huawei */

#define FIX_1113_CLDFB_REND_IN_ISAR                     /* issue 1113: fix the use of CLDFB renderer in split-rendering at the external renderer */

#define NONBE_1328_FIX_NON_LINEARITY                    /* VA: Fix possible issue when computing bwe_exc_extended and previous frame were almost 0  */

#define NONBE_FIX_1376_MDCT_CONCEALMENT                 /* FhG: fix concealment artifact in MDCT Stereo with DTX, in case transition frame gets lost */

/* #################### End BASOP porting switches ############################ */

            decoder_tcx_tns( st, L_frame_global[ch], L_spec[ch], L_frame[ch], L_frameTCX[ch], &x[ch][k][0], fUseTns[ch][k], &tnsData[ch][k], bfi, k, 1 );

            sns_shape_spectrum( x[ch][k], st->hTcxCfg->psychParamsCurrent, &sns_int_scf[0], st->hTcxCfg->psychParamsCurrent->nBins );

#ifdef NONBE_FIX_1376_MDCT_CONCEALMENT

            /*

               2025-09-07, mul:

               in case of PLC, applying SNS up to L_spec might not be enough: In case the transition frame from DTX after an inactive period is lost, L_spec is assumed to represent a regular TCX frame,

               however, this frame is nevertheless acting as an transition frame as also visible in L_frameTCX; thus, the safer approach to prevent high frequency artifacts is to apply the SNS up to L_frameTCX;

               in case this is not necessary, x[] is filled with zeros, and the multiplication is not causing any additional harm

            */

            v_multc( x[ch][k] + st->hTcxCfg->psychParamsCurrent->nBins, sns_int_scf[FDNS_NPTS - 1], x[ch][k] + st->hTcxCfg->psychParamsCurrent->nBins, max( L_spec[ch], L_frameTCX[ch] ) - st->hTcxCfg->psychParamsCurrent->nBins );

#else

            v_multc( x[ch][k] + st->hTcxCfg->psychParamsCurrent->nBins, sns_int_scf[FDNS_NPTS - 1], x[ch][k] + st->hTcxCfg->psychParamsCurrent->nBins, L_spec[ch] - st->hTcxCfg->psychParamsCurrent->nBins );

#endif

            decoder_tcx_tns( st, L_frame_global[ch], L_spec[ch], L_frame[ch], L_frameTCX[ch], &x[ch][k][0], fUseTns[ch][k], &tnsData[ch][k], bfi, k, 0 );

        }