Fix ignore case logic for header-name and cookie-name

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #191 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   72.52%   72.57%   +0.04%     
==========================================
  Files          89       89              
  Lines        3247     3252       +5     
  Branches      422      422              
==========================================
+ Hits         2355     2360       +5     
  Misses        725      725              
  Partials      167      167

Impacted Files	Coverage Δ
...et/Matchers/Request/RequestMessageHeaderMatcher.cs	94.44% <100%> (+0.32%)	⬆️
...et/Matchers/Request/RequestMessageCookieMatcher.cs	93.33% <100%> (+0.31%)	⬆️

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