Fix closed PR color from gray to red

[seachicken]

Gray only if the state is Open and draft, along with GitHub UI.

[codecov]

Codecov Report

Merging #36 (c2696cc) into main (63af4a9) will increase coverage by 0.02%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   88.95%   88.97%   +0.02%     
==========================================
  Files           3        3              
  Lines         507      508       +1     
==========================================
+ Hits          451      452       +1     
+ Misses         44       43       -1     
- Partials       12       13       +1     

Impacted Files	Coverage Δ
main.go	80.16% <40.00%> (+0.16%)	⬆️

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