DFT+U bugfix for Gamma-only with spinors
Description
Fix a bug that was leading to the access of the X(orb) array outside of the bound in the case of gamma-only without phase, which arises mostly for Gamma-only spinor calculations.
News snippet
Minor bugfix for DFT+U.
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.