Fix a wrong copy of to the old vxc potential for BB mixing of OEP.
Description
Fix a wrong copy of to the old vxc potential for BB mixing of OEP for spin-polarized calculations.
News snippet
Fix a wrong copy of to the old vxc potential for BB mixing of OEP for spin-polarized calculations.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.