Fix several small bugs for the calculation of the commutator of [r,V_NL]
Description
Fix several small bugs for the calculation of the commutator of [r,V_NL]
News snippet
Minor bugfixes for the current computed with DFT+U(+V)
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.