Fix Grafana start on local dev after upgrade to NixOS 21.11

Grafana 8 on NixOS 21.11 fails harder than 7.x on 21.05 when its
`grafana-admin.password` file is missing.  Provide it regardless
whether Google auth is configured or not.

morph/lib/monitoring.nix

@@ -121,6 +121,8 @@ in {
           permissions = "0400";
           action = ["sudo" "systemctl" "restart" "grafana.service"];
         };
+      })
+      {
         "grafana-admin-password" = {
           source = "${privateKeyPath}/grafana-admin.password";
           destination = "/run/keys/grafana-admin.password";
@@ -129,7 +131,7 @@ in {
           permissions = "0400";
           action = ["sudo" "systemctl" "restart" "grafana.service"];
         };
-      })
+      }
       (lib.mkIf cfg.enableSlackAlert {
         "grafana-slack-url" = {
           source = "${privateKeyPath}/grafana-slack-url";