Fix tracklabels positioning not updating in UI after user selection

[cmdcolin]

There is a UI bug where selecting the tracklabels "offset" option doesn't update the UI in 1.6.7, a knock on effect of fixing a bug from 1.6.6

[codecov]

Codecov Report

Merging #2825 (51ee3e2) into main (02012ec) will increase coverage by 0.02%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##             main    #2825      +/-   ##
==========================================
+ Coverage   59.99%   60.01%   +0.02%     
==========================================
  Files         584      584              
  Lines       26687    26688       +1     
  Branches     6462     6462              
==========================================
+ Hits        16010    16017       +7     
+ Misses      10349    10343       -6     
  Partials      328      328              

Impacted Files	Coverage Δ
...src/LinearGenomeView/components/TrackContainer.tsx	87.17% <77.77%> (+0.33%)	⬆️
...ckages/core/pluggableElementTypes/RpcMethodType.ts	83.33% <0.00%> (-2.09%)	⬇️
products/jbrowse-web/src/util.ts	27.27% <0.00%> (ø)
packages/core/util/layouts/GranularRectLayout.ts	87.17% <0.00%> (+0.42%)	⬆️
...lignments/src/BamAdapter/BamSlightlyLazyFeature.ts	78.09% <0.00%> (+1.90%)	⬆️
...s/svg/src/SvgFeatureRenderer/components/Chevron.js	97.43% <0.00%> (+10.25%)	⬆️

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