fix: bugs check valid gradient color

[FajarKim]

Description

Fixes bug for check input bg_color with gradient color.

Type of change

• Bug fix (added a non-breaking change which fixes an issue)
• New feature (added a non-breaking change which adds functionality)
• Updated documentation (updated the readme, templates, or other repo files)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Misc change (updated other files non-breaking change)

How Has This Been Tested?

• Tested locally with a valid username
• Tested locally with an invalid username
• Ran tests with npm test
• Added or updated test cases to test new features

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Screenshots

No screenshots

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Name	Status	Preview	Updated (UTC)
github-readme-profile	✅ Ready (Inspect)	Visit Preview	Jan 6, 2024 2:25am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (04db312) 47.61% compared to head (4aac9d9) 47.61%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #225   +/-   ##
=======================================
  Coverage   47.61%   47.61%           
=======================================
  Files          13       13           
  Lines         273      273           
  Branches       73       73           
=======================================
  Hits          130      130           
  Misses        128      128           
  Partials       15       15           

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