Update prosemirror.scss

[pschopen]

Extend multi-line checkbox.

📝 Summary

• Resolves: #

🖼️ Screenshots

Bug

Fixed

🏚️ Before	🏡 After
B	A

🚧 TODO

• ...

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits
• Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• Documentation (README or documentation) has been updated or is not required

[juliusknorr]

Thanks for the PR, i also did a fix for this in #4735 combined with simplification of the overall checkbox styling.

[juliusknorr]

Will close this then as the other pr got merged. The contribution is still much appreciated

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