Also update IWireMockMiddlewareOptions when settings are updated via admin interface

[StefH]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 4 lines in your changes missing coverage. Please review.

Project coverage is 86.57%. Comparing base (9a49e6a) to head (cf833bb).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/WireMock.Net/Server/WireMockServer.Admin.cs	72.72%	2 Missing and 1 partial ⚠️
...reMock.Net/Owin/WireMockMiddlewareOptionsHelper.cs	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1166   +/-   ##
=======================================
  Coverage   86.56%   86.57%           
=======================================
  Files         429      429           
  Lines       24200    24208    +8     
=======================================
+ Hits        20948    20957    +9     
+ Misses       2350     2348    -2     
- Partials      902      903    +1     

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