correct syntax in postgresql_user call in ansible

Former-commit-id: 4b2232191d48d49573171ae589d19ec9032fe5d5

ansible/deploy.yaml

@@ -80,8 +80,8 @@
     - name: restart postgresql service
       systemd: state=restarted name=postgresql enabled=yes
     - postgresql_user:
-        name: {{dbuser}}
-        password: {{dbpassword}}
+        name: "{{ dbuser }}"
+        password: "{{ dbpassword }}"
         role_attr_flags: CREATEDB,NOSUPERUSER
     #
     # Stop web server(s)