test(test-image): don't let nvim autocomplete conf to config, damnit

Author: hunleyd

ansible/tasks/test-image.yml

@@ -33,7 +33,7 @@
   failed_when: verify_result.rc != 0
   when: debpkg_mode or stage2_nix
 
-- command: cat /etc/postgresql/postgresql.config
+- command: cat /etc/postgresql/postgresql.conf
   register: pgconf
 - debug:
     msg: "{{ pgconf.stdout }}"