Fixed a bug in appconfig, where an initially empty set value led to endless duplicates of this app/key pair.

Path by Elias Probst <mail@eliasprobst.eu>

The search box style is a design decision, search boxes are always styled differently from other inputs.
This reverts commit 9d48ca75.

That way Apps that have a long name (like OpenStreetGame for instance)
show their name troncated instead of continuing over the application frame.

Also fixed a typo in db.php