Make EvalModeConvertible reflexive

[lsrcz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.19%. Comparing base (ab6f722) to head (9328aed).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Grisette/Internal/Unified/Util.hs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #284      +/-   ##
==========================================
- Coverage   75.23%   75.19%   -0.04%     
==========================================
  Files         210      210              
  Lines       30801    30803       +2     
  Branches     2203     2207       +4     
==========================================
- Hits        23172    23162      -10     
- Misses       5426     5434       +8     
- Partials     2203     2207       +4     

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