Unify the sizes of FFT grids for cufft and clfft, as clfft now supports the same sizes as cufft.
Description
Unify the sizes of FFT grids for cufft and clfft, as clfft now supports the same sizes as cufft.
News snippet
Minor change to the interface with clfft.
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.