Adding a fix for igCheckboxEditor #1984 19.1

[valadzhov]

Closes #1984

Additional information (check all that apply):

• [x] Bug fix
• [ ] New functionality
• [ ] Documentation
• [ ] Demos
• [ ] CI/CD

Checklist:

• [x] All relevant tags have been applied to this PR
• [ ] This PR includes unit tests covering all the new code
• [ ] This PR includes API docs for newly added methods/properties
• [ ] This PR includes general feature table updates in the root README.MD
• [ ] This PR contains breaking changes
• [ ] This PR includes behavioral changes and the feature specification has been updated with them

[coveralls]

Coverage increased (+0.007%) to 83.997% when pulling c0fc8b561880de223073514ec7f501da112a73f8 on valadzhov/fix-igCheckboxEditor-1984-19.1 into 9d39ec44f61413802a2bf01552b10b4623b2922f on 19.1.

[wnvko]

In GC when checkbox is focused the tick is still invisible. When checkbox loses focus the thick is visible.