Revert PortUtil.cs changes

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #147 into master will decrease coverage by <.01%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
- Coverage   67.78%   67.78%   -0.01%     
==========================================
  Files          80       80              
  Lines        2930     2933       +3     
  Branches      394      395       +1     
==========================================
+ Hits         1986     1988       +2     
  Misses        727      727              
- Partials      217      218       +1

Impacted Files	Coverage Δ
src/WireMock.Net/Http/PortUtil.cs	85.71% <83.33%> (-3.18%)	⬇️

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