#3103 added showButton option to GeoLocate control.

[smellman]

#3103 added showButton option to GeoLocate control.

Launch Checklist

• [x] Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!
• [x] Briefly describe the changes in this PR.
• [x] Link to related issues.
• [x] Include before/after visuals or gifs if this PR includes visual changes.
• [x] Write tests for all new functionality.
• [x] Document any changes to public APIs.
• [ ] Post benchmark scores.
• [x] Add an entry to CHANGELOG.md under the ## main section.