BodyAsFile should use BodyAsFileIsCached value

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #729 (06a1cdf) into master (d3ac811) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #729      +/-   ##
==========================================
+ Coverage   75.66%   75.72%   +0.06%     
==========================================
  Files         175      175              
  Lines        6340     6340              
  Branches      646      646              
==========================================
+ Hits         4797     4801       +4     
+ Misses       1349     1346       -3     
+ Partials      194      193       -1     

Impacted Files	Coverage Δ
src/WireMock.Net/Server/WireMockServer.Admin.cs	58.78% <100.00%> (ø)
src/WireMock.Net/ResponseBuilders/Response.cs	95.04% <0.00%> (+0.41%)	⬆️
src/WireMock.Net/Serialization/MappingConverter.cs	60.86% <0.00%> (+1.63%)	⬆️

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