Fix k space coordinates in pearl_vortex

[loganbvh]

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[codecov]

Codecov Report

Merging #74 (544eb3f) into main (f2d0667) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #74   +/-   ##
=======================================
  Coverage   96.46%   96.46%           
=======================================
  Files          34       34           
  Lines        4162     4162           
=======================================
  Hits         4015     4015           
  Misses        147      147           

Impacted Files	Coverage Δ
superscreen/sources/vortex.py	100.00% <100.00%> (ø)

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