Fix KtIterable.minWith returned max

[passsy]

There was a copy-paste error in the tests hiding the wrong implementation of minWith. minBy worked as expected

[codecov]

Codecov Report

Merging #88 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #88   +/-   ##
=======================================
  Coverage   99.83%   99.83%           
=======================================
  Files          41       41           
  Lines        1845     1845           
=======================================
  Hits         1842     1842           
  Misses          3        3

Impacted Files	Coverage Δ
...collection/extension/iterable_extension_mixin.dart	99.58% <100%> (ø)	⬆️

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