Fix missing dropdown text on medium sizes

[jaggy]

This fixes an issue where the text is missing on the dropdown on tablet breakpoints when the "Show icons only on tablet screens" is toggled.

Changes proposed in this pull request: This PR update the CSS to show the button text on dropdown links.

Screenshot Here's how the fix looks after.

Confirmed

• [x] Frontend changes: tested on a local Flarum installation.
• [ ] Backend changes: tests are green (run composer test) No backend changes.

[luceos]

This fix is sponsored by Orion Browser by Kagi 👍