The FFT app doesn't actually work for 1D ffts

[abadams]

The FFT app seems to advertise support for 1D ffts in the generator params, but if you actually invoke it with the default generator params it hits an infinite loop in the radix helper function for size 0, and fails an assert in the inner fft function for size 1. This app really only does non-trivial 2D ffts.

This was triggered by running the generator directly with default generator params and seeing all my memory get consumed by an ever-increasing vector of radix factors.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.10%. Comparing base (e02a03f) to head (dd9a7e4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9449      +/-   ##
==========================================
+ Coverage   70.03%   70.10%   +0.06%     
==========================================
  Files         261      261              
  Lines       79802    79802              
  Branches    19455    19455              
==========================================
+ Hits        55892    55943      +51     
+ Misses      17997    17992       -5     
+ Partials     5913     5867      -46     

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