fix(explore): save chart not working

[villebro]

SUMMARY

Saving a chart is currently broken due to the save action returning an incorrect object, likely caused by #11997.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue: closes Save overwrite chart and add to dashboard error #12177
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #12178 (2941493) into master (942e321) will decrease coverage by 3.70%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master   #12178      +/-   ##
==========================================
- Coverage   66.75%   63.05%   -3.71%     
==========================================
  Files         994      994              
  Lines       49068    49059       -9     
  Branches     4979     4979              
==========================================
- Hits        32756    30933    -1823     
- Misses      16184    17926    +1742     
- Partials      128      200      +72     

Flag	Coverage Δ
cypress	?
javascript	61.23% <50.00%> (ø)
python	64.23% <ø> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
...t-frontend/src/explore/actions/saveModalActions.js	61.29% <0.00%> (ø)
...rset-frontend/src/explore/components/SaveModal.tsx	85.88% <100.00%> (ø)
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 175 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 942e321...2941493. Read the comment docs.

[rusackas]

LGTM!