fix: hide modal after overwrite

[hughhhh]

SUMMARY

close SaveDatasetModal on overwrite completion

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #20924 (0312394) into master (4d29d16) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #20924      +/-   ##
==========================================
- Coverage   66.31%   66.30%   -0.01%     
==========================================
  Files        1758     1758              
  Lines       67039    67065      +26     
  Branches     7116     7122       +6     
==========================================
+ Hits        44457    44468      +11     
- Misses      20752    20767      +15     
  Partials     1830     1830              

Flag	Coverage Δ
javascript	52.01% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...d/src/SqlLab/components/SaveDatasetModal/index.tsx	34.88% <0.00%> (-0.42%)	⬇️
superset-frontend/src/utils/localStorageHelpers.ts	90.00% <0.00%> (ø)
.../explore/components/ExploreViewContainer/index.jsx	52.19% <0.00%> (ø)
...nd/src/explore/controlUtils/getSectionsToRender.ts	80.95% <0.00%> (+0.95%)	⬆️
...rset-frontend/src/explore/components/SaveModal.tsx	37.61% <0.00%> (+1.14%)	⬆️

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