Update kgrid.py

[djps]

Fixes #604

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.70%. Comparing base (2bb4e63) to head (f00e2c0).
⚠️ Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
kwave/kgrid.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #605   +/-   ##
=======================================
  Coverage   73.70%   73.70%           
=======================================
  Files          50       50           
  Lines        6953     6953           
  Branches     1325     1325           
=======================================
  Hits         5125     5125           
  Misses       1283     1283           
  Partials      545      545           

Flag	Coverage Δ
3.10	73.70% <0.00%> (ø)
3.11	73.70% <0.00%> (ø)
3.12	73.70% <0.00%> (ø)
3.13	73.70% <0.00%> (ø)
macos-latest	73.68% <0.00%> (ø)
ubuntu-latest	73.68% <0.00%> (ø)
windows-latest	73.69% <0.00%> (ø)

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