Resolve "ParamMC reconfiguration does not deallocate the CLDFB buffer for the imaginary parts (asan)"

• Related issues: #867 (closed)
• Requested reviewers: @kiene

Reason why this change is needed

Due to a copy and paste error in the reconfiguration function of ParamMC, only the CLDFB buffer for the real part is deallocated when necessary, the imaginary part is not, leading to an asan.

Description of the change

Fix reallocation of the ParamMC CLDFB buffers for the imaginary part

Affected operating points

• BE but fixes crash with instrumented code
• Produced bitstream is BE compared to previous state (no encoder changes).

Related to #867 (closed)