[native] Delete broken Android custom font symlinks

Summary:
These symlinks are currently broken. Initially this diff fixed the symlinks, but then I realized I should just delete them since they apparently weren't needed. The Test Plan works with the files deleted, and I think it's because we're using @expo/vector-icons and expo-font to load these, and they don't need the files in this location.

The old react-native link, deprecated as of React Native 0.69, would put fonts in this folder. I think the folder still works for bundling assets with your app statically, but expo-font just doesn't need the files in that folder.

Test Plan: Make sure the CommIcon named cloud-filled still loads on Android in dev and release builds

Reviewers: atul, ginsu, tomek

Reviewed By: atul

Differential Revision: https://phab.comm.dev/D7579