Fix the RefNameAutocomplete displaying a stale value for chromosome names

[cmdcolin]

Fix the refnameautocomplete displaying a stale value for refname in some cases e.g. could see this visiting config_dotplot.json and then launching a lineargenomeview on the import form: it displayed peach in the assembly selector but with grape chromosome names

Affected released versions of jb2 e.g. v2.1.7, v2.1.0, and probably further back

The cause boils down to the "useState" being sticky when we want it to reset it's state when assembly changes

[cmdcolin]

I made a silly blogpost about this issue with stick useState's that need to be reset recently. It's a hard issue to catch/be aware of except just to be careful with useState's https://cmdcolin.github.io/posts/2022-10-10-reactstate

[codecov]

Codecov Report

Merging #3306 (058dc85) into main (6c639ac) will decrease coverage by 0.00%.
The diff coverage is 52.94%.

@@            Coverage Diff             @@
##             main    #3306      +/-   ##
==========================================
- Coverage   59.45%   59.45%   -0.01%     
==========================================
  Files         735      735              
  Lines       28980    28981       +1     
  Branches     7011     7009       -2     
==========================================
  Hits        17231    17231              
- Misses      11503    11504       +1     
  Partials      246      246              

Impacted Files	Coverage Δ
packages/core/ui/AssemblySelector.tsx	100.00% <ø> (ø)
plugins/dotplot-view/src/DotplotView/model.ts	59.07% <0.00%> (-0.26%)	⬇️
...iew/src/LinearGenomeView/components/ImportForm.tsx	80.76% <56.25%> (+0.24%)	⬆️
products/jbrowse-web/src/util.ts	48.33% <0.00%> (ø)

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