I noticed the sidebar was using the fallback icons for woff/woff2
webfont files, instead of the font icon:

<img width="195" alt="CleanShot 2024-04-22 at 03 01 18@2x"
src="https://github.com/zed-industries/zed/assets/5074763/2e925c33-0be5-4ed9-ae87-ce72f95f8416">

With this PR, I'm hoping all those font files would use the A icon
instead.

Release Notes:

- Updated`.woff` & `.woff2` file types in the sidebar to display the
font icon.