Fix error introduced in previous commit

cmd/acmeserver/acmeserver.go

@@ -52,7 +52,7 @@ func main() {
 	var h http.Handler
 	var cg acmeserver.CertGenerator
 	if !config.ACME.Testing {
-		acme, err := acmeserver.NewACME(config.ACME) // nolint: vetshadow
+		acme, err := acmeserver.NewACME(&config.ACME) // nolint: vetshadow
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -69,7 +69,7 @@ func main() {
 		})
 	}
 
-	m, err := acmeserver.NewManager(config.ACME, cg)
+	m, err := acmeserver.NewManager(&config.ACME, cg)
 	if err != nil {
 		log.Fatal(err)
 	}