fix: Select clear and loading icons overlap

[michael-s-molina]

SUMMARY

Fixes #19063

AFTER SCREENSHOTS OR ANIMATED GIF

Screen.Recording.2022-03-08.at.4.42.31.PM.mov

TESTING INSTRUCTIONS

Check the original issue 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 #19070 (d303951) into master (f9c7405) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #19070      +/-   ##
==========================================
- Coverage   66.50%   66.49%   -0.01%     
==========================================
  Files        1642     1642              
  Lines       63442    63443       +1     
  Branches     6439     6440       +1     
==========================================
- Hits        42191    42189       -2     
- Misses      19582    19583       +1     
- Partials     1669     1671       +2     

Flag	Coverage Δ
javascript	51.22% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
superset-frontend/src/components/Select/Select.tsx	85.28% <100.00%> (+0.06%)	⬆️
...eFilters/FiltersConfigModal/FiltersConfigModal.tsx	63.04% <0.00%> (-1.64%)	⬇️

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[geido]

LGTM. Thanks for the fix!