Add fix FIX_1483_PEAQ_VQ_ENC_MSAN_ERROR to address MSAN error

• Related issues: #1483
• Related BASOP MR: sa4/audio/ivas-basop!2676
• Requested reviewers: @kiene

Reason why this change is needed

• A corner case where no PVQ bands are selected in the HVQ encoding mode. The number of selected bands was uninitialized in this case.

Description of the change

• Initialize number of selected PVQ bands n_sel_bands in hvq_pvq_bitalloc.c to zero

Affected operating points

• Seems to be BE, but could potentially affect the output.