Remaining TODO from merge

There is a TODO comment left from the merge main -> main-pc about split rendering. See https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/blob/1d4909390902867d550353317d8b33724d265803/lib_dec/ivas_jbm_dec_fx.c#L2360. This should be reviewed if is valid or can be removed.