Fixup scroll on wiggle tracks with trackLabels->offset

[cmdcolin]

This PR #2678 produced a bad layout on wiggle type tracks

xref
https://jbrowse.org/code/jb2/v1.6.6/?config=test_data%2Fvolvox%2Fconfig.json&session=share-pQCVXdXf9X&password=fdako

prev version
https://jbrowse.org/code/jb2/v1.6.5/?config=test_data%2Fvolvox%2Fconfig.json&session=share-pQCVXdXf9X&password=fdako

we don't want a scrollbar

this PR reverts the TrackContainer part of #2678

[cmdcolin]

I added a couple more changes that preserves the double line and fixes the scroll

[codecov]

Codecov Report

Merging #2821 (cc5e099) into main (4ad5d56) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #2821      +/-   ##
==========================================
- Coverage   60.00%   59.99%   -0.02%     
==========================================
  Files         584      584              
  Lines       26689    26687       -2     
  Branches     6462     6462              
==========================================
- Hits        16014    16010       -4     
- Misses      10345    10349       +4     
+ Partials      330      328       -2     

Impacted Files	Coverage Δ
...rc/LinearGenomeView/components/TracksContainer.tsx	63.75% <ø> (ø)
...ns/wiggle/src/LinePlotRenderer/LinePlotRenderer.js	67.30% <ø> (-2.34%)	⬇️
...src/LinearGenomeView/components/TrackContainer.tsx	86.84% <80.00%> (+6.28%)	⬆️
packages/core/TextSearch/TextSearchManager.ts	96.55% <0.00%> (-3.45%)	⬇️
...inearGenomeView/components/RefNameAutocomplete.tsx	77.77% <0.00%> (-3.04%)	⬇️
.../linear-genome-view/src/LinearGenomeView/index.tsx	85.10% <0.00%> (-0.18%)	⬇️
packages/core/util/analytics.ts	91.83% <0.00%> (+2.04%)	⬆️

---

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 4ad5d56...cc5e099. Read the comment docs.