Fix file upload component "remove" (✖️) button styles

[shawnbot]

Before (bad):

After (better):

Eventually:

[github-actions[bot]]

Size Change: +53 B (0%)

Total Size: 88.6 kB

Filename	Size	Change
dist/formio-sfds.standalone.js	68.2 kB	+53 B (0%)

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `dist/formio-sfds.css` | 14 kB | | `dist/portal.js` | 6.37 kB |

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