Fix path creation for hosted version

[mthenw]

This PR prevents from creating wrong path for system events in case of hosted version called via IP.

Todos:

• Write tests
• Write documentation
• Fix linting errors
• Make sure code coverage hasn't dropped
• Provide verification commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: Yes
Is it a breaking change?: NO

[codecov]

Codecov Report

Merging #491 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master   #491      +/-   ##
========================================
+ Coverage   70.97%    71%   +0.02%     
========================================
  Files          37     37              
  Lines        2188   2190       +2     
========================================
+ Hits         1553   1555       +2     
  Misses        572    572              
  Partials       63     63

Impacted Files	Coverage Δ
router/path.go	100% <100%> (ø)	⬆️
router/path_hosted.go	85.71% <100%> (+2.38%)	⬆️
router/router.go	64.91% <100%> (ø)	⬆️

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[sebito91]

Seems to simplify the extractedPath, nicely done. I like the test too.