fix: Removes duplicated import in dashboard filter state tests

[michael-s-molina]

SUMMARY

Removes duplicated import in dashboard filter state tests.

TESTING INSTRUCTIONS

1 - Execute all tests
2 - All tests should pass

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 #17887 (24e4f5d) into master (ef57bd1) will not change coverage.
The diff coverage is n/a.

❗ Current head 24e4f5d differs from pull request most recent head 016e65c. Consider uploading reports for the commit 016e65c to get more accurate results

@@           Coverage Diff           @@
##           master   #17887   +/-   ##
=======================================
  Coverage   66.91%   66.91%           
=======================================
  Files        1609     1609           
  Lines       64897    64897           
  Branches     6866     6866           
=======================================
  Hits        43426    43426           
  Misses      19605    19605           
  Partials     1866     1866           

Flag	Coverage Δ
mysql	82.19% <ø> (ø)
postgres	82.24% <ø> (ø)
python	82.32% <ø> (ø)
sqlite	81.92% <ø> (ø)

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

Impacted Files	Coverage Δ
superset/utils/async_query_manager.py	82.24% <0.00%> (ø)

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[mayurnewase]

thanks, now that hook is working properly lol, and is already fixed in #17886
you may wanna rebase this on master.