Unnecessary reallocation of DirAC metadata buffers in SBA bit rate switching
### Basic info - Commit SHA: main - Platform: all ### Bug description The fix for #391 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, #459, #460. ### Ways to reproduce (Clear steps or refer to a failing automated test, e.g. with a pipeline link) <!--- 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. -->
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