re-enabled skipped tests

This was unnecessary. Not related to this PR, but also not worth a
separate PR. Can probably move this commit directly to the main branch.

Author: RobinMalfait

packages/tailwindcss/src/candidate.test.ts

@@ -483,7 +483,7 @@ it('should parse a utility with a modifier and a variant', () => {
   `)
 })
 
-it.skip('should not parse a partial utility', () => {
+it('should not parse a partial utility', () => {
   let utilities = new Utilities()
   utilities.static('flex', () => [])
   utilities.functional('bg', () => [])