[fix] [two state button] loader background color inconsistent when checked

[rkondra-eightfold]

SUMMARY:

• When checked prop is true for 2 state button , the loader background is default and not button background

GITHUB ISSUE (Open Source Contributors)

JIRA TASK (Eightfold Employees Only):

https://eightfoldai.atlassian.net/browse/ENG-121243

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist (storybook tests)
• I have added unittests for this change

TEST PLAN:

• Visit storybook for TwoStateButton
• Toggle loading to True
• toggle checked to True, before vs after

• Regression test: checked false, loading true, etc ...

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.61%. Comparing base (9496364) to head (ba628da).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #921   +/-   ##
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  Coverage   84.61%   84.61%           
=======================================
  Files        1100     1100           
  Lines       20488    20488           
  Branches     7748     7748           
=======================================
  Hits        17335    17335           
  Misses       3066     3066           
  Partials       87       87           

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[rkondra-eightfold]