fix(color-select): Do not prefill color picker value on init

[tvdeyen]

What is this pull request for?

For single color inputs without a set of colors we want to be able to remove the color.

Checklist

• I have followed Pull Request guidelines
• I have added a detailed description into each commit message
• I have added tests to cover this change

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.48%. Comparing base (8146559) to head (cdd54c7).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3629   +/-   ##
=======================================
  Coverage   97.48%   97.48%           
=======================================
  Files         314      314           
  Lines        8269     8270    +1     
=======================================
+ Hits         8061     8062    +1     
  Misses        208      208           

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[alchemycms-bot]

💚 All backports created successfully

Status	Branch	Result
✅	8.1-stable

Questions ?

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