Fix circular view being rendered as a blank area if tab is opened in the background

[cmdcolin]

Fixes #2921

Basically the initial load gets out of whack because the width is 0 (https://github.com/GMOD/jbrowse-components/compare/width_initialized_circular?expand=1#diff-73c3047508be77cca92bdbd3a5c691bd72be00e1cc3ebba7001c9cb1315d4070L107) in this case #2921

This code is similar to what the linear genome view does, it makes sure that setWidth has been called before trying to perform any operations. Possibly just making it non-zero can help, but i believe it's best to start loading after the browser has told us what space it has to render (this especially helps with linear genome view to avoid false-starts for data fetching)

[codecov]

Codecov Report

Merging #3415 (a46c9a1) into main (cc6a0eb) will decrease coverage by 0.00%.
The diff coverage is 70.53%.

@@            Coverage Diff             @@
##             main    #3415      +/-   ##
==========================================
- Coverage   61.23%   61.23%   -0.01%     
==========================================
  Files         816      817       +1     
  Lines       29520    29526       +6     
  Branches     7109     7111       +2     
==========================================
+ Hits        18077    18079       +2     
- Misses      11270    11275       +5     
+ Partials      173      172       -1     

Impacted Files	Coverage Δ
...rc/LinearSNPCoverageDisplay/components/Tooltip.tsx	35.71% <5.26%> (ø)
...gle/src/LinearWiggleDisplay/components/Tooltip.tsx	35.71% <30.76%> (ø)
...cular-view/src/CircularView/models/CircularView.ts	77.34% <76.70%> (+2.48%)	⬆️
...ular-view/src/CircularView/components/Controls.tsx	83.33% <83.33%> (ø)
...ar-view/src/CircularView/components/ImportForm.tsx	75.00% <83.33%> (+1.08%)	⬆️
...-view/src/CircularView/components/CircularView.tsx	100.00% <100.00%> (+10.25%)	⬆️
...ircular-view/src/CircularView/components/Ruler.tsx	66.12% <0.00%> (-22.59%)	⬇️
...-genome-view/src/createModel/createSessionModel.ts	11.48% <0.00%> (+1.35%)	⬆️
...r-genome-view/src/createModel/createConfigModel.ts	77.77% <0.00%> (+22.22%)	⬆️

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