Admin Reskin: Change color picker height to match new design system.

Update min-height from 30px to 32px for the color picker button and related elements to match new design system.

Props audrasjb, hmbashar, huzaifaalmesbah, joedolson, juanmaguitar, mukesh27, noruzzaman, ozgursar, rahultank, rcorrales, sajib1223, tusharaddweb, vgnavada, wildworks.

Fixes #64761.

git-svn-id: https://develop.svn.wordpress.org/trunk@62191 602fd350-edb4-49c9-b593-d223f7449a82