Fix: double declare uui-h styles to bring back previous specificity

[madsrasmussen]

Description

After we allowed .uui-h* classes to be used outside a .uui-text container it got a lower specifity. I have fixed this so it is still possible to use the styles like previously.

How to test:

• Make sure the .uui-h* styles work outside a .uui-text container.
• Make sure you can override a h1, h2, h3 style inside a .uui-text container with a .uui-h* class.
• Example <div class="uui-text"><h1 class="uui-h3">This should have h3 styling</h1></div>

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

[leekelleher]

Tested out, the fix works. 🤠