package/sconeserver: add sqlite optional dependency

sqlite is an optional dependency which is enabled by default since
https://github.com/sconemad/sconeserver/commit/4120395991c2c63abef58426beee4ecf5879c204



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>