UseNLog includes EnvironmentName when loading NLog config

[snakefoot]

Followup to #714

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (660da18) 80.73% compared to head (3233de5) 80.92%.

Files	Patch %	Lines
...tensions.Hosting/Extensions/ConfigureExtensions.cs	75.00%	0 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #715      +/-   ##
==========================================
+ Coverage   80.73%   80.92%   +0.18%     
==========================================
  Files          19       19              
  Lines        1739     1735       -4     
  Branches      299      304       +5     
==========================================
  Hits         1404     1404              
+ Misses        198      194       -4     
  Partials      137      137              

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