fix(cross-filter): fix scheme py

[simcha90]

SUMMARY

Fix chart_configuration field in dashboard json metadata scheme.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #13665 (363f8d4) into master (0e0c99b) will decrease coverage by 5.20%.
The diff coverage is 100.00%.

❗ Current head 363f8d4 differs from pull request most recent head 35f8c48. Consider uploading reports for the commit 35f8c48 to get more accurate results

@@            Coverage Diff             @@
##           master   #13665      +/-   ##
==========================================
- Coverage   76.46%   71.26%   -5.21%     
==========================================
  Files         921      838      -83     
  Lines       46769    41805    -4964     
  Branches     5644     4334    -1310     
==========================================
- Hits        35761    29791    -5970     
- Misses      10848    12014    +1166     
+ Partials      160        0     -160     

Flag	Coverage Δ
cypress	56.57% <ø> (+5.25%)	⬆️
hive	80.25% <100.00%> (ø)
javascript	?
mysql	80.55% <100.00%> (ø)
postgres	80.59% <100.00%> (-0.02%)	⬇️
presto	80.28% <100.00%> (ø)
python	81.08% <100.00%> (-0.03%)	⬇️
sqlite	?

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Impacted Files	Coverage Δ
superset/dashboards/schemas.py	99.36% <100.00%> (ø)
...uperset-frontend/src/dashboard/util/dnd-reorder.js	0.00% <0.00%> (-100.00%)	⬇️
...rset-frontend/src/dashboard/util/getEmptyLayout.js	0.00% <0.00%> (-100.00%)	⬇️
...et-frontend/src/components/Pagination/Ellipsis.tsx	0.00% <0.00%> (-100.00%)	⬇️
...-frontend/src/components/OmniContainer/Omnibar.tsx	0.00% <0.00%> (-100.00%)	⬇️
...frontend/src/components/ErrorMessage/IssueCode.tsx	0.00% <0.00%> (-100.00%)	⬇️
...rc/components/ErrorMessage/TimeoutErrorMessage.tsx	0.00% <0.00%> (-100.00%)	⬇️
...dashboard/components/resizable/ResizableHandle.jsx	0.00% <0.00%> (-100.00%)	⬇️
...tersConfigModal/Footer/CancelConfirmationAlert.tsx	0.00% <0.00%> (-100.00%)	⬇️
...ConfigModal/FiltersConfigForm/FilterScope/state.ts	0.00% <0.00%> (-100.00%)	⬇️
... and 507 more

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