Fix the default configuration SQLite db path (#143)

config.cfg

@@ -26,8 +26,7 @@ debug = false
 engine = "sqlite3"
 # Connection string, filename for sqlite3 and postgres://$username:$password@$host/$db_name for postgres
 # Please note that the default Docker image uses path /var/lib/acme-dns/acme-dns.db for sqlite3
-#connection = "/var/lib/acme-dns/acme-dns.db"
-connection = "acme-dns.db"
+connection = "/var/lib/acme-dns/acme-dns.db"
 # connection = "postgres://user:password@localhost/acmedns_db"
 
 [api]