fix: Rendering standalone chart

[agatapst]

SUMMARY

This PR fixes problem with rendering standalone charts.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

Go to Charts and click on a chart. When it's loaded add &standalone=true to the URL and check if chart is rendered.

ADDITIONAL INFORMATION

• Has associated issue: Superset slice API with standalone to true error #12176
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

cc @villebro

[codecov-io]

Codecov Report

Merging #12179 (881635c) into master (942e321) will decrease coverage by 3.76%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #12179      +/-   ##
==========================================
- Coverage   66.75%   62.99%   -3.77%     
==========================================
  Files         994      994              
  Lines       49068    49093      +25     
  Branches     4979     4978       -1     
==========================================
- Hits        32756    30926    -1830     
- Misses      16184    17967    +1783     
- Partials      128      200      +72     

Flag	Coverage Δ
cypress	?
javascript	61.23% <0.00%> (+<0.01%)	⬆️
python	64.13% <ø> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ntend/src/explore/components/ExploreChartPanel.jsx	13.63% <0.00%> (-62.49%)	⬇️
...nd/src/explore/components/ExploreViewContainer.jsx	2.59% <ø> (-74.03%)	⬇️
superset-frontend/src/explore/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/dashboard/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/setup/setupColors.js	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/chart/ChartContainer.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/reducers/index.js	0.00% <0.00%> (-100.00%)	⬇️
...et-frontend/src/dashboard/containers/Dashboard.jsx	0.00% <0.00%> (-100.00%)	⬇️
...t-frontend/src/dashboard/containers/SliceAdder.jsx	0.00% <0.00%> (-100.00%)	⬇️
...t-frontend/src/explore/reducers/getInitialState.js	0.00% <0.00%> (-100.00%)	⬇️
... and 181 more

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[rusackas]

LGTM! Just trying to get the flaky tests to pass now.