Fix for 1571, use correct length for copying array, potentially [non-BE]

Jan Kienerequested to merge
float-1571-wrong-length-used-for-copying-of-array-in-ivas_mdct_core_invq into main

Reason why this change is needed

  • Wrong length used for copying array

Description of the change

  • Use the correct length

Affected operating points

  • May affect BE for MDCT-Stereo PLC

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