Fixes bug on URL highlight param in which refName aliases were not working

[carolinebridge]

Fixes #4261

works
https://s3.amazonaws.com/jbrowse.org/code/jb2/fix-ref-name-highlight/index.html?config=test_data%2Fconfig_demo.json&assembly=hg19&loc=1:1,937,214..2,081,004&highlight=1:2,000,000-2,100,000&tracks=repeats_hg19

works
https://s3.amazonaws.com/jbrowse.org/code/jb2/fix-ref-name-highlight/index.html?config=test_data%2Fconfig_demo.json&assembly=hg19&loc=1:1,937,214..2,081,004&highlight=chr1:2,000,000-2,100,000&tracks=repeats_hg19

[codecov]

Codecov Report

Attention: Patch coverage is 21.42857% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 62.59%. Comparing base (67d5877) to head (dcccb54).

Files	Patch %	Lines
...view/src/LinearGenomeView/components/Highlight.tsx	16.66%	5 Missing ⚠️
.../LinearGenomeView/components/OverviewHighlight.tsx	33.33%	4 Missing ⚠️
...ar-genome-view/src/LaunchLinearGenomeView/index.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4275      +/-   ##
==========================================
- Coverage   62.60%   62.59%   -0.01%     
==========================================
  Files        1087     1087              
  Lines       31404    31413       +9     
  Branches     7497     7501       +4     
==========================================
+ Hits        19659    19664       +5     
- Misses      11572    11574       +2     
- Partials      173      175       +2     

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[cmdcolin]

can use assemblyManager.get(model.highlight.assemblyName) instead of find here