fix: remove background image from custom checkbox focus styles

[MeesoPost]

Het voorkomt dat de checked image al inlaad zodat als je erop focused en de background color veranderd naar een donkere kleur dat de checkmark verschijnt zoals in purmerend

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Name	Status	Preview	Comments	Updated (UTC)
utrecht	❌ Failed (Inspect)			Dec 24, 2024 1:35am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.20%. Comparing base (c5d4232) to head (50cccbc).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2675   +/-   ##
=======================================
  Coverage   90.20%   90.20%           
=======================================
  Files         188      188           
  Lines        1644     1644           
  Branches      352      351    -1     
=======================================
  Hits         1483     1483           
- Misses        155      157    +2     
+ Partials        6        4    -2     

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[Robbert]

@MeesoPost Waarom fixt dit iets?

[MeesoPost]

Het voorkomt dat de checked image al inlaad zodat als je erop focused en de background color veranderd naar een donkere kleur dat de checkmark verschijnt zoals in purmerend

[Yolijn]

Great!

Could you also make sure the background image is not set on other states like :active?

Also this PR needs a changeset to create a new release :)