Fix typo in mutation kustomize

[mmirecki]

Typo in file name
The related file is here:
https://github.com/open-policy-agent/gatekeeper/blob/f3ec64a56154cd991e98387329083d243c967879/config/crd/bases/mutations.gatekeeper.sh_assign.yaml

[maxsmythe]

LGTM

@sozercan @ritazh LGTY?

[codecov-io]

Codecov Report

Merging #960 (0508126) into master (f3ec64a) will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #960      +/-   ##
==========================================
- Coverage   43.62%   43.46%   -0.16%     
==========================================
  Files          52       52              
  Lines        3200     3200              
==========================================
- Hits         1396     1391       -5     
- Misses       1610     1614       +4     
- Partials      194      195       +1     

Flag	Coverage Δ
unittests	43.46% <ø> (-0.16%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...onstrainttemplate/constrainttemplate_controller.go	55.70% <0.00%> (-1.63%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f3ec64a...0508126. Read the comment docs.