Simplify postgres uuid-ossp stirng

db.go

@@ -28,7 +28,7 @@ func (h *Headscale) initDB() error {
 	h.db = db
 
 	if h.dbType == Postgres {
-		db.Exec("create extension if not exists \"uuid-ossp\";")
+		db.Exec(`create extension if not exists "uuid-ossp";`)
 	}
 
 	_ = db.Migrator().RenameColumn(&Machine{}, "ip_address", "ip_addresses")