Fixes the calculation of the current for spinors
Description
Fixes the calculation of the current for spinors.
This got introduced in !2011 (merged). A test is now made more stringent to detect a potential regression in the future.
News snippet
Fixes the calculation of the current for spinors.
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.