fix: wrong column name 'Gender'

[zuzhi]

SUMMARY

Closes #12505

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

BEFORE:

AFTER:

TEST PLAN

1. Run 'superset load_example' again
2. Should see no errors in this dashboard

ADDITIONAL INFORMATION

• Has associated issue: [Dashboard] FCC New Coder Survey 2018, Error: Columns missing in datasource: ['Gender'] #12505
• 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 #12506 (e3c458c) into master (52ba82f) will decrease coverage by 7.65%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12506      +/-   ##
==========================================
- Coverage   66.83%   59.17%   -7.66%     
==========================================
  Files        1015      959      -56     
  Lines       49594    46832    -2762     
  Branches     5081     4344     -737     
==========================================
- Hits        33144    27713    -5431     
- Misses      16320    19119    +2799     
+ Partials      130        0     -130     

Flag	Coverage Δ
cypress	50.94% <ø> (+<0.01%)	⬆️
javascript	?
python	63.80% <ø> (-0.33%)	⬇️

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

Impacted Files	Coverage Δ
...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%)	⬇️
...dashboard/components/resizable/ResizableHandle.jsx	0.00% <0.00%> (-100.00%)	⬇️
.../src/dashboard/util/getFilterScopeFromNodesTree.js	0.00% <0.00%> (-93.48%)	⬇️
...set-frontend/src/views/CRUD/alert/ExecutionLog.tsx	11.76% <0.00%> (-88.24%)	⬇️
...src/dashboard/components/gridComponents/Header.jsx	10.52% <0.00%> (-86.85%)	⬇️
superset-frontend/src/components/IconTooltip.tsx	13.33% <0.00%> (-86.67%)	⬇️
...rc/dashboard/components/gridComponents/Divider.jsx	13.33% <0.00%> (-86.67%)	⬇️
...end/src/SqlLab/components/ExploreResultsButton.jsx	8.00% <0.00%> (-84.00%)	⬇️
...nd/src/views/CRUD/data/query/QueryPreviewModal.tsx	14.70% <0.00%> (-82.97%)	⬇️
... and 399 more

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[junlincc]

thank you so much for your contribution🙏
may have to leave this open(or close it), in favor of #12530

cc @betodealmeida

[zuzhi]

@junlincc It's ok. Glad to see it's fixed.