Fix FileSystemWatcher

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #733 (247cafa) into master (344f5c8) will decrease coverage by 0.13%.
The diff coverage is 21.42%.

@@            Coverage Diff             @@
##           master     #733      +/-   ##
==========================================
- Coverage   75.72%   75.59%   -0.14%     
==========================================
  Files         175      175              
  Lines        6340     6350      +10     
  Branches      646      650       +4     
==========================================
- Hits         4801     4800       -1     
- Misses       1346     1356      +10     
- Partials      193      194       +1     

Impacted Files	Coverage Δ
src/WireMock.Net/Server/WireMockServer.Admin.cs	57.66% <19.51%> (-1.12%)	⬇️
src/WireMock.Net/Server/WireMockServer.cs	67.57% <100.00%> (+0.12%)	⬆️

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