fix a cookbook

[tjhei]

gwb-grid fails without this change

@MFraters should the tester catch this? where is the logic that runs the ./cookbooks/?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b72ce04) 93.49% compared to head (0e9c751) 93.49%.
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #547   +/-   ##
=======================================
  Coverage   93.49%   93.49%           
=======================================
  Files          92       92           
  Lines        6346     6346           
=======================================
  Hits         5933     5933           
  Misses        413      413           

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.021 ± 0.003 (s=427)	1.022 ± 0.003 (s=456)	+0.0% .. +0.1%
Slab interpolation curved simple none	1.026 ± 0.004 (s=445)	1.026 ± 0.003 (s=435)	-0.1% .. +0.1%
Spherical slab interpolation simple none	1.260 ± 0.008 (s=344)	1.261 ± 0.014 (s=372)	-0.1% .. +0.3%
Slab interpolation simple curved CMS	1.099 ± 0.003 (s=407)	1.099 ± 0.004 (s=415)	-0.1% .. +0.1%
Spherical slab interpolation simple CMS	1.859 ± 0.005 (s=252)	1.858 ± 0.005 (s=235)	-0.1% .. +0.1%
Spherical fault interpolation simple none	1.264 ± 0.009 (s=339)	1.264 ± 0.008 (s=376)	-0.2% .. +0.2%
Cartesian min max surface	2.366 ± 0.018 (s=199)	2.369 ± 0.021 (s=184)	-0.1% .. +0.4%
Spherical min max surface	7.368 ± 0.025 (s=64)	7.370 ± 0.021 (s=61)	-0.2% .. +0.2%

[tjhei]

I found two places where this is used.

[MFraters]

Great, thanks for finding this. This is ready to merge.