fix or remove FileInstaller
Seems like the File Installer thing, which is responsible for downloading and "installing" zip files, is currently broken in fdroid classic
it seems almost unused. the f-droid privileged extension ota package is the only(?) zip file I think it in the main repo. and "installing" that via f-droid doesn't exactly do anything useful.
I mean the idea of distributing arbitrary files via fdroid is nice... but in reality it seems to see almost no usage.