In the decoder-struct, the members ``` int16_t bits_frame_nominal; /* avg bits per frame on active frame */ int32_t last_bits_frame_nominal; /* last avg bits per frame on active frame */ ``` have inconsistent types. It is proposed to align these, also to be aligned to recenet proposed changes in BASOP (see https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/merge_requests/3026), i.e. turn `last_bits_frame_nominal` into `int16_t`. <!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary.-->