chore: Remove wrong usage of font-size in ExploreViewContainer

[geido]

SUMMARY

It removes an unnecessary font-size and fixes a className to match the right layout as detailed in #19099

BEFORE

AFTER

TESTING INSTRUCTIONS

1. Open Explore
2. Make sure the title of the left side panel has the right font-size and color

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 #19614 (bb01d03) into master (83c3779) will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #19614      +/-   ##
==========================================
- Coverage   66.63%   66.44%   -0.19%     
==========================================
  Files        1680     1681       +1     
  Lines       64292    64397     +105     
  Branches     6564     6593      +29     
==========================================
- Hits        42839    42787      -52     
- Misses      19751    19926     +175     
+ Partials     1702     1684      -18     

Flag	Coverage Δ
javascript	51.13% <ø> (-0.33%)	⬇️

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

Impacted Files	Coverage Δ
.../explore/components/ExploreViewContainer/index.jsx	54.39% <ø> (ø)
...ts/nativeFilters/FilterBar/FilterControls/state.ts	0.00% <0.00%> (-75.00%)	⬇️
...veFilters/FilterBar/FilterControls/FilterValue.tsx	6.59% <0.00%> (-53.85%)	⬇️
...tend/src/filters/components/Time/transformProps.ts	0.00% <0.00%> (-50.00%)	⬇️
...oard/components/nativeFilters/FilterCard/index.tsx	10.00% <0.00%> (-50.00%)	⬇️
...d/src/filters/components/Time/TimeFilterPlugin.tsx	0.00% <0.00%> (-47.06%)	⬇️
...Filters/FilterBar/FilterControls/FilterControl.tsx	29.03% <0.00%> (-41.94%)	⬇️
...rset-frontend/src/filters/components/Time/index.ts	66.66% <0.00%> (-33.34%)	⬇️
...hboard/components/nativeFilters/FilterBar/utils.ts	53.84% <0.00%> (-23.08%)	⬇️
...ts/nativeFilters/FilterBar/ActionButtons/index.tsx	85.71% <0.00%> (-14.29%)	⬇️
... and 41 more

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[michael-s-molina]

I'm not sure if we can make this change without changing the other headers together. The Dataset header looked disproportional when testing the application. It looks like those commit all or roll back all kinds of PR. What do you think @kasiazjc?

[geido]

Just had a discussion with Kasia. All of those headers should be 12px and I am going to apply the changes to this PR

[geido]

@michael-s-molina here is how it looks now

[michael-s-molina]

Waaaaaay better! Thanks!

[michael-s-molina]

LGTM