Fixing issue in utilities plugin

[jonrohan]

I was noticing that the plugin was missing some cases in practice. For example it would miss the .foo class in the example below.

body {
  font-size: 12px;
}

.foo {
  margin-top: $spacer-1;
}

Example in code

This was because of the return false in my selector check. This was stopping the processing of the rest of the page when it happened.

I added a test case for this bug.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4820ad9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/stylelint-config	Patch

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