Remove savedSessions from configs

[garrettjstevens]

savedSessions no longer gets loaded from the config file after #1240. This removes references to it in demo configs, and moves a saved session to defaultSession where applicable.

[garrettjstevens]

Easier to view the diff hiding whitespace: https://github.com/GMOD/jbrowse-components/pull/1383/files?diff=split&w=1

[codecov]

Codecov Report

Merging #1383 into master will decrease coverage by 0.02%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master    #1383      +/-   ##
==========================================
- Coverage   59.42%   59.40%   -0.03%     
==========================================
  Files         418      418              
  Lines       18680    18683       +3     
  Branches     4402     4404       +2     
==========================================
- Hits        11101    11098       -3     
- Misses       7286     7290       +4     
- Partials      293      295       +2     

Impacted Files	Coverage Δ
...iew/src/LinearGenomeView/components/ImportForm.tsx	66.66% <ø> (ø)
...c/LinearGenomeView/components/LinearGenomeView.tsx	79.16% <ø> (-4.17%)	⬇️
products/jbrowse-web/src/Loader.tsx	71.35% <0.00%> (ø)
...ment/src/AddTrackWidget/components/ConfirmTrack.js	48.57% <27.27%> (-5.53%)	⬇️
packages/core/util/index.ts	83.61% <0.00%> (+0.34%)	⬆️
packages/core/util/analytics.ts	77.50% <0.00%> (+2.50%)	⬆️

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[cmdcolin]

This could be a different discussion but I believe there is room for something like exampleSessions, something an admin can configure to demo their instance.

So just rename savedSessions to exampleSessions?

[garrettjstevens]

I agree that would be a good follow-on, it's similar to the sessionTemplates idea I've talked about before, and maybe they could have their own section on the splash screen. For now I think we need this, though, since there are sessions in the demo configs that we are currently unable to access.

[cmdcolin]

xref #1384 for that follow on