Bugfix for nik_axis
Description
Bugfix for oct-wannier90. This line was wrongly resetting nik_axis to 1, whereas it could contain the information of the KPointsGrid. This was preventing running oct-wannier90 with a KPointsGrid and a KPointsPath.
News snippet
Bugfix for oct-wannier90.
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.