Add length=2 for center

[CommanderStorm]

Launch Checklist

The center property is missing the length which means that this does not get properly validated.

• Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!
• Briefly describe the changes in this PR.
• Add an entry to CHANGELOG.md under the ## main section.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.70%. Comparing base (e0b8a84) to head (482d398).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1372      +/-   ##
==========================================
+ Coverage   93.68%   93.70%   +0.01%     
==========================================
  Files         111      111              
  Lines        4389     4387       -2     
  Branches     1390     1389       -1     
==========================================
- Hits         4112     4111       -1     
+ Misses        277      276       -1     

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