Hotfix fft 1D 1D
Description
Fix the kernel for 1D periodic FFTs. The G=0 component was not calculated and was using instead G=1. All the other kernel seem the do the pading of frequencies properly.
News snippet
Fix the kernel for 1D periodic FFTs.
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.