Fix local session failing to load copying between tabs in some cases

[cmdcolin]

Fixes #3240

[cmdcolin]

main fix, here: moving this broadcast channel listener up

[codecov]

Codecov Report

Merging #3241 (5d37dc1) into main (a602dc9) will decrease coverage by 0.22%.
The diff coverage is 7.69%.

@@            Coverage Diff             @@
##             main    #3241      +/-   ##
==========================================
- Coverage   59.41%   59.19%   -0.23%     
==========================================
  Files         674      674              
  Lines       28783    28781       -2     
  Branches     7009     7008       -1     
==========================================
- Hits        17101    17036      -65     
- Misses      11407    11460      +53     
- Partials      275      285      +10     

Impacted Files	Coverage Δ
products/jbrowse-web/src/SessionLoader.ts	61.30% <7.69%> (+0.52%)	⬆️
plugins/data-management/src/ucsc-trackhub/model.js	30.76% <0.00%> (-46.16%)	⬇️
.../data-management/src/ucsc-trackhub/ucscTrackHub.js	4.68% <0.00%> (-28.13%)	⬇️
...eElementTypes/models/BaseConnectionModelFactory.ts	56.25% <0.00%> (-18.75%)	⬇️
...svg/src/SvgFeatureRenderer/components/Segments.tsx	85.71% <0.00%> (-7.15%)	⬇️
...src/SvgFeatureRenderer/components/FeatureLabel.tsx	77.50% <0.00%> (-5.00%)	⬇️
...gins/svg/src/SvgFeatureRenderer/components/util.ts	91.83% <0.00%> (-4.09%)	⬇️
products/jbrowse-web/src/util.ts	48.33% <0.00%> (-1.67%)	⬇️
...FeatureRenderer/components/ProcessedTranscript.tsx	87.32% <0.00%> (-1.41%)	⬇️
plugins/alignments/src/BamAdapter/BamAdapter.ts	72.07% <0.00%> (-0.91%)	⬇️
... and 4 more

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