Fix ProtoBuf mapping.json

[StefH]

close #1233

[codecov]

Codecov Report

Attention: Patch coverage is 72.59259% with 37 lines in your changes missing coverage. Please review.

Project coverage is 36.91%. Comparing base (888d913) to head (1da7316).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...reMock.Net/Server/WireMockServer.ConvertMapping.cs	78.00%	11 Missing ⚠️
src/WireMock.Net/Util/PortUtils.cs	64.51%	11 Missing ⚠️
src/WireMock.Net/RequestBuilders/Request.cs	60.00%	6 Missing ⚠️
...eMock.Net/ResponseBuilders/Response.WithHeaders.cs	0.00%	3 Missing ⚠️
src/WireMock.Net/Util/ProtoDefinitionHelper.cs	85.71%	2 Missing ⚠️
...t/Matchers/Helpers/BodyDataMatchScoreCalculator.cs	75.00%	1 Missing ⚠️
src/WireMock.Net/ResponseBuilders/Response.cs	80.00%	1 Missing ⚠️
src/WireMock.Net/Serialization/MatcherMapper.cs	66.66%	1 Missing ⚠️
src/WireMock.Net/Server/RespondWithAProvider.cs	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1236      +/-   ##
==========================================
+ Coverage   35.11%   36.91%   +1.79%     
==========================================
  Files         203      230      +27     
  Lines       33366    41450    +8084     
==========================================
+ Hits        11718    15303    +3585     
- Misses      21095    25451    +4356     
- Partials      553      696     +143     

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