fix(explore): Icons in "Customize Columns" in "Customize" tab break to a new line

[geido]

SUMMARY

Applies the style to the "Customize Columns" component and cleans up some repeated styles.

BEFORE

AFTER

TESTING INSTRUCTIONS

1. Open a "Games" chart in Explore
2. Visit the "Customize" tab
3. Make sure the "Customize Columns" are not breaking into new lines

ADDITIONAL INFORMATION

• Has associated issue: Fixes [Explore] line wrapping in column formatting menu #14831
• 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 #14839 (3a44376) into master (d46aa60) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #14839      +/-   ##
==========================================
- Coverage   77.62%   77.61%   -0.01%     
==========================================
  Files         963      963              
  Lines       49236    49239       +3     
  Branches     6192     6192              
==========================================
  Hits        38219    38219              
- Misses      10817    10820       +3     
  Partials      200      200              

Flag	Coverage Δ
javascript	72.47% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
.../src/explore/components/ControlPanelsContainer.tsx	79.16% <0.00%> (-1.69%)	⬇️
.../src/explore/components/controls/SelectControl.jsx	89.38% <ø> (ø)

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[villebro]

LGTM and the generalization makes total sense (can't think of a case where we don't want inline-block and etc for type-label), thanks for the fix!