fix(checkbox): apply 'checked-color' when 'checkbox' is indeterminate

[keeplearning66]

This PR is to fix #13552

The selected state color and indeterminate state color of a group of checkboxes could be better if kept consistent, as this would create a more unified style

Set 'checked-color' to 'red',comparison of effects:

Before modification

After modification

I didn't see any unit tests related to the color, so I didn't add the corresponding unit tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.73%. Comparing base (ec5b45b) to head (c669235).
Report is 122 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13553      +/-   ##
==========================================
+ Coverage   89.60%   89.73%   +0.12%     
==========================================
  Files         257      257              
  Lines        7013     7043      +30     
  Branches     1736     1743       +7     
==========================================
+ Hits         6284     6320      +36     
+ Misses        384      383       -1     
+ Partials      345      340       -5     

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[keeplearning66]

Although the literal meaning of 'checked-color' is the color for the checked state, if this property is not applied to the indeterminate state, the indeterminate state will have no color property set, which may lead to inconsistent styling.
For example, the following situation

[chenjiahan]

Thank you!