Fix Icon as CSS background not working when another className is in front

[origami-z]

3583

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Name	Status	Preview	Comments	Updated (UTC)
saltdesignsystem	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 18, 2024 3:59pm

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🦋 Changeset detected

Latest commit: a6f42f4754ddc0c4865aa3e5a11e97131a68a82d

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

This PR includes changesets to release 1 package

| Name | Type | | -------------- | ----- | | @salt-ds/icons | Patch |

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