Let React LGV navigate without setting displayedRegion first

[garrettjstevens]

Since navToLocString takes an optional assemblyName parameter now, we can avoid having to set a displayedRegion before navigating.

A similar thing could also possible be used in #1798.

[codecov]

Codecov Report

Merging #1822 (dfc2438) into master (e2594e3) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #1822   +/-   ##
=======================================
  Coverage   58.85%   58.85%           
=======================================
  Files         459      459           
  Lines       21389    21385    -4     
  Branches     5051     5048    -3     
=======================================
- Hits        12589    12587    -2     
+ Misses       8489     8487    -2     
  Partials      311      311           

Impacted Files	Coverage Δ
...se-react-linear-genome-view/src/createViewState.ts	50.00% <0.00%> (+7.14%)	⬆️
...inearGenomeView/components/RefNameAutocomplete.tsx	89.36% <0.00%> (-4.26%)	⬇️

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[rbuels]

any reason this is still a draft? seems straightforward

[garrettjstevens]

marked ready for review

[teresam856]

lgtm