Fix case when numeric inference kicks out before minimal tautology inference

[ChernikovP]

Attempt to address https://github.com/fthomas/refined/issues/613.

Basically, numeric inference kicks in before minimal tautology.

scala> implicitly[Inference[Positive And Less[10], Positive]]
val res0: /* ... */ = Inference(false,conjunctionEliminationL(greaterInferenceNat(0, 0)))

or even simpler:

scala> implicitly[Inference[Positive, Positive]]
val res1: /* ... */  = Inference(false,greaterInferenceNat(0, 0))

[codecov[bot]]

Codecov Report

Merging #894 (3d1b04c) into master (ac4a55f) will not change coverage. The diff coverage is n/a.

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##           master     #894   +/-   ##
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  Coverage   91.52%   91.52%           
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  Files          48       48           
  Lines         531      531           
  Branches       12        8    -4     
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  Hits          486      486           
  Misses         45       45           

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