mkRemovedOptionModule: assert on removed options

We don't want to ignore config that can mess up machines. In general
this should always fail evaluation, as you think you are changing
behaviour and don't, which can easily create run-time errors we can
catch early.

nixos/modules/services/monitoring/prometheus/exporters/nginx.nix

@@ -49,6 +49,6 @@ in
     (mkRemovedOptionModule [ "insecure" ] ''
       This option was replaced by 'prometheus.exporters.nginx.sslVerify'.
     '')
-    ({ options.warnings = options.warnings; })
+    ({ options.warnings = options.warnings; options.assertions = options.assertions; })
   ];
 }