Fix WithCallback logic when using other fluent builder statements

[StefH]

No description provided.

[StefH]

#569

[codecov]

Codecov Report

Merging #587 (b6ad277) into master (e23249c) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #587      +/-   ##
==========================================
+ Coverage   75.88%   75.94%   +0.05%     
==========================================
  Files         141      141              
  Lines        5437     5449      +12     
  Branches      546      546              
==========================================
+ Hits         4126     4138      +12     
  Misses       1148     1148              
  Partials      163      163              

Impacted Files	Coverage Δ
src/WireMock.Net/ResponseBuilders/Response.cs	94.66% <100.00%> (+0.30%)	⬆️

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

95.7% Coverage
0.0% Duplication