Fix issue with :memory: DBs

Previously would get an error when searching complaining about tables
not existing. This was caused by go-sqlite3 creating new connections.
cache=shared is supposed to fix this, but does not seem to work unless
you specify file: before the filename?

cmd/logsuck/main.go

@@ -212,7 +212,7 @@ func main() {
 		},
 			configSources...)
 	} else {
-		db, err := sql.Open("sqlite3", staticConfig.SQLite.DatabaseFile+"?cache=shared&_journal_mode=WAL")
+		db, err := sql.Open("sqlite3", "file:"+staticConfig.SQLite.DatabaseFile+"?cache=shared&_journal_mode=WAL")
 		if err != nil {
 			log.Fatalln(err.Error())
 		}