test: Fixes act errors in ErrorBoundary test

[michael-s-molina]

SUMMARY

This PR fixes 1 act error in superset-frontend/src/components/ErrorBoundary/ErrorBoundary.test.tsx

TESTING INSTRUCTIONS

• Execute the component tests
• Observe that there are no act errors in the console

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 #21412 (46836eb) into master (3197cc6) will increase coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 46836eb differs from pull request most recent head 9cf303b. Consider uploading reports for the commit 9cf303b to get more accurate results

@@            Coverage Diff             @@
##           master   #21412      +/-   ##
==========================================
+ Coverage   66.52%   66.54%   +0.02%     
==========================================
  Files        1791     1791              
  Lines       68593    68593              
  Branches     7319     7319              
==========================================
+ Hits        45630    45644      +14     
+ Misses      21072    21052      -20     
- Partials     1891     1897       +6     

Flag	Coverage Δ
javascript	52.77% <ø> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
...board/components/nativeFilters/FilterBar/index.tsx	65.94% <0.00%> (+5.79%)	⬆️
...rd/components/nativeFilters/FilterBar/keyValue.tsx	40.74% <0.00%> (+22.22%)	⬆️

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