fix(uninstall): actually fix uninstall this time

refs #220
- nothing to see here 🙈

lib/commands/uninstall.js

@@ -42,7 +42,7 @@ module.exports.execute = function execute() {
         let instances = systemConfig.get('instances', {})
         each(instances, (instance, pname) => {
             if (instance.cwd === process.cwd()) {
-                delete systemConfig[pname];
+                delete instances[pname];
             }
         });
         systemConfig.set('instances', instances).save();