test: Fixes act errors in PopoverSection test

[michael-s-molina]

SUMMARY

This PR fixes 4 act errors in superset-frontend/src/components/PopoverSection/PopoverSection.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 #21416 (229c599) into master (3197cc6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #21416   +/-   ##
=======================================
  Coverage   66.52%   66.52%           
=======================================
  Files        1791     1791           
  Lines       68593    68593           
  Branches     7319     7319           
=======================================
  Hits        45630    45630           
  Misses      21072    21072           
  Partials     1891     1891           

Flag	Coverage Δ
javascript	52.73% <ø> (ø)

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