Fix Proxying when StartAdminInterface=true

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #778 (ac8c2a1) into master (be4b0ad) will increase coverage by 0.02%.
The diff coverage is 77.72%.

@@            Coverage Diff             @@
##           master     #778      +/-   ##
==========================================
+ Coverage   71.95%   71.97%   +0.02%     
==========================================
  Files         209      209              
  Lines        7248     7280      +32     
  Branches      750      753       +3     
==========================================
+ Hits         5215     5240      +25     
- Misses       1805     1810       +5     
- Partials      228      230       +2     

Impacted Files	Coverage Δ
.../WireMock.Net/Extensions/TimeSettingsExtensions.cs	21.05% <6.66%> (ø)
src/WireMock.Net/Util/BytesEncodingUtils.cs	32.37% <33.88%> (ø)
...c/WireMock.Net/Serialization/TimeSettingsMapper.cs	50.00% <50.00%> (ø)
src/WireMock.Net/Owin/HostUrlOptions.cs	52.00% <64.70%> (-4.53%)	⬇️
src/WireMock.Net/Util/PortUtils.cs	60.00% <65.00%> (ø)
src/WireMock.Net/Owin/Mappers/OwinRequestMapper.cs	91.22% <69.23%> (-6.74%)	⬇️
src/WireMock.Net/Server/WireMockServer.Admin.cs	65.79% <83.33%> (ø)
src/WireMock.Net/Owin/WireMockMiddleware.cs	86.82% <85.71%> (+0.24%)	⬆️
src/WireMock.Net/Util/CompressionUtils.cs	90.90% <89.47%> (ø)
src/WireMock.Net/Util/HttpStatusRangeParser.cs	91.17% <89.65%> (ø)
... and 36 more

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