Changed format Culture to InvariantCulture to match default NLog Culture

[snakefoot]

Resolves #733

[codecov-commenter]

Codecov Report

Merging #735 (516a2e3) into master (d3f0657) will decrease coverage by 0%.
The diff coverage is 89%.

@@          Coverage Diff          @@
##           master   #735   +/-   ##
=====================================
- Coverage      62%    62%   -0%     
=====================================
  Files          45     45           
  Lines         783    779    -4     
  Branches      188    188           
=====================================
- Hits          487    483    -4     
  Misses        227    227           
  Partials       69     69           

Impacted Files	Coverage Δ
...utRenderers/AspNetRequestDurationLayoutRenderer.cs	64% <75%> (ø)
...tRenderers/AspNetApplicationValueLayoutRenderer.cs	80% <100%> (+5%)	⬆️
...d/LayoutRenderers/AspNetItemValueLayoutRenderer.cs	91% <100%> (-2%)	⬇️
...ayoutRenderers/AspNetSessionValueLayoutRenderer.cs	86% <100%> (-3%)	⬇️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

94.1% Coverage
0.0% Duplication