fix: disabled input backgrounds

[bitpshr]

Type: bug

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code matches the style guide
• [x] Unit tests are included in the PR
• [x] For new widgets, an entry has been added to the .dojorc
• [x] For new widgets, theme.variant() is added to the root domnode
• [x] Any widget variant uses theme.compose like this
• [x] WidgetProperties are exported

Description:

This pull request consolidates disabled backgrounds between Select and other inputs. A few different underlying issues caused the difference in background color: Select used an unnecessary explicit background color, and Input incorrectly applied background styles.

Resolves #1703

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dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/6avfeTxAzF7fFDmpYWymAuRn9XHE
✅ Preview: https://dojowidgets-git-fork-bitpshr-fix-disabled-input-bg-dojo1.vercel.app

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/ibm927tUn4CCuVZ4c8s3GA3sqxP3
✅ Preview: https://widget-test-docs-git-fork-bitpshr-fix-disabled-input-bg-dojo1.vercel.app

[codecov[bot]]

Codecov Report

Merging #1703 (478b76b) into master (ce182a0) will increase coverage by 0.11%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1703      +/-   ##
==========================================
+ Coverage   89.96%   90.07%   +0.11%     
==========================================
  Files          94       94              
  Lines        5031     5050      +19     
  Branches     1364     1373       +9     
==========================================
+ Hits         4526     4549      +23     
  Misses        249      249              
+ Partials      256      252       -4     

Impacted Files	Coverage Δ
src/tooltip/index.tsx	77.41% <0.00%> (ø)
src/select/index.tsx	86.95% <0.00%> (+0.86%)	:arrow_up:
src/list/index.tsx	79.94% <0.00%> (+2.16%)	:arrow_up:

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[bitpshr]

Closing in favor of #1702.