Standardize heights of widgets in LGV import form

[cmdcolin]

Fixes #2861

Kinda picky but looks nicer this way

Explicitly provides a height to the AssemblySelector and the RefNameAutocomplete via InputProps

The git bisect showed that the cause of this was adding ScopedCssBaseline to @jbrowse/react-linear-genome-view which wasn't a huge hint but maybe hinted that things should be a bit more explicit

[codecov]

Codecov Report

Merging #2902 (1e9ff4b) into main (6e56875) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2902   +/-   ##
=======================================
  Coverage   59.92%   59.93%           
=======================================
  Files         587      587           
  Lines       26620    26621    +1     
  Branches     6474     6474           
=======================================
+ Hits        15953    15954    +1     
  Misses      10365    10365           
  Partials      302      302           

Impacted Files	Coverage Δ
packages/core/ui/AssemblySelector.tsx	90.24% <ø> (ø)
...me-view/src/LinearGenomeView/components/Header.tsx	85.00% <ø> (ø)
...iew/src/LinearGenomeView/components/ImportForm.tsx	78.94% <100.00%> (+0.28%)	⬆️
.../linear-genome-view/src/LinearGenomeView/index.tsx	85.10% <100.00%> (ø)

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[cmdcolin]

can see results here

https://jbrowse.org/storybook/lgv/lgv_height/?path=/story/getting-started--page
https://jbrowse.org/code/jb2/lgv_height/