fix variable

tasks/install.yml

@@ -22,14 +22,14 @@
     notify: __postgres_restart
     register: __postgres_systemd
 
-  - name: just force systemd to reread configs (2.4 and above)
+  - name: Force systemd to re-read configs
     systemd:
       daemon_reload: True
     when: __postgres_systemd.changed
 
   - name: Check if database is initialized
     stat:
-      path: "{{ postgres_data_dir }}/PG_VERSION"
+      path: "{{ __postgres_data_dir }}/PG_VERSION"
     register: __pgdata_dir_version
 
   - name: Ensure database is initialized