fix: Filtering db names while creating dataset is not working

[michael-s-molina]

SUMMARY

Fixes the search of databases in dataset modal.

@hughhhh

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Screen.Recording.2021-10-07.at.3.52.05.PM.mov

Screen.Recording.2021-10-07.at.3.48.42.PM.mov

TESTING INSTRUCTIONS

Check the videos for instructions.

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 #17023 (f282327) into master (9ef2861) will not change coverage.
The diff coverage is 83.33%.

@@           Coverage Diff           @@
##           master   #17023   +/-   ##
=======================================
  Coverage   76.93%   76.93%           
=======================================
  Files        1030     1030           
  Lines       55086    55086           
  Branches     7478     7478           
=======================================
  Hits        42381    42381           
  Misses      12454    12454           
  Partials      251      251           

Flag	Coverage Δ
javascript	70.89% <83.33%> (ø)

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Impacted Files	Coverage Δ
...frontend/src/components/DatabaseSelector/index.tsx	95.00% <ø> (ø)
superset-frontend/src/components/Select/Select.tsx	92.25% <83.33%> (ø)

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[rosemarie-chiu]

🏷 2021.40