FIX refine stop criteria

[MatthewSZhang]

Checklist

• Used a personal fork to propose changes
• A reference to a related issue: FIX refine uses wrong stop criteria #183
• A description of the changes: change the stop criteria from i < n_features to i < n_features_to_select

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (c2a8ca5) to head (1d9680e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #184   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          611       611           
=========================================
  Hits           611       611           

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