fix(nav): don't emit '(navChange)' when 'activeId' is not set initially

[maxokorokov]

Fixes #3564

[codecov-io]

Codecov Report

Merging #3567 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #3567   +/-   ##
=======================================
  Coverage   91.67%   91.67%           
=======================================
  Files         100      100           
  Lines        2882     2882           
  Branches      532      532           
=======================================
  Hits         2642     2642           
  Misses        183      183           
  Partials       57       57

Flag	Coverage Δ
#e2e	56.28% <0%> (ø)	⬆️
#unit	88.5% <100%> (ø)	⬆️

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

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4f61496...3b69475. Read the comment docs.