Please fix some config in obtainium apps store

[nOneCode4u]

Obtainium app store have some old config.
Errors occurs after refreshing obtainium list for updates.
Normally adding any links work perfectly but adding config from apps store shows error.
I have added these apps from app store, not checked all other apps.
Please fix it.

[DarkCrypt]

Mull is dead and was removed, PR #525.

FFUpdater was also removed because it doesn't meet the app criteria, PR #526. You can fix your config by deleting app-full-release from the APK filter.

Bunny is fixed, PR #529.

IronFox seems to be working.