Unnecessary reallocation of DirAC metadata buffers in SBA bit rate switching

Basic info

• Commit SHA: main
• Platform: all

Bug description

The fix for #391 (closed) introduces a flag dirac_param_estim_old which is set after resetting dirac_param_estim in ivas_dirac_config meaning that reallocation of the DirAC MD buffers is triggered on a bit rate switch even if decoder parameter estimation is on for both the previous and current bit rate. Will be handled in a cumulative fix for this issue and issues #393 (closed), #459 (closed), #460 (closed).

Ways to reproduce

(Clear steps or refer to a failing automated test, e.g. with a pipeline link)