clippy: use char instead of closure

[cakebaker]

This PR fixes a warning from the manual_pattern_char_comparison lint on Windows.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.89%. Comparing base (ea9f41b) to head (124dbc8).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #81   +/-   ##
=======================================
  Coverage   94.89%   94.89%           
=======================================
  Files           4        4           
  Lines         941      941           
=======================================
  Hits          893      893           
  Misses         48       48           

Flag	Coverage Δ
macos_latest	99.30% <ø> (ø)
ubuntu_latest	99.31% <ø> (ø)
windows_latest	94.40% <100.00%> (ø)

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