bugfix to use stachelink properly

[Blackbaud-BrandonJones]

https://github.com/blackbaud/stache2/issues/449
Solved 2 problems:

The router would not navigate to a fragment on another page if the fragment also existed on the current page.

The router would not navigate on the current page if the path was . with a fragment.

[codecov-io]

Codecov Report

Merging #452 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #452   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          82     82           
  Lines        1075   1077    +2     
  Branches      132    132           
=====================================
+ Hits         1075   1077    +2

Impacted Files	Coverage Δ
src/app/public/src/modules/nav/nav.service.ts	100% <100%> (ø)	⬆️

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[blackbaud-brandonhare]

LGTM. Nice work!