mtrcs0: Remove Ansible user/become settings

Jenkins still connects as *jenkins* and uses `sudo`, so we can't
hard-code the user to *root*.

host_vars/mtrcs0.pyrocufflink.red.yml

@@ -1,6 +1,3 @@
-ansible_user: root
-ansible_become: false
-
 host_uses_firewalld: false
 collectd_unixsock_plugin: false