Update patroni.yml.j2 (#719)

Avoid problem when jinja2 treats value 'on' as True. In result in pg config will be value True

Author: garry-t

roles/patroni/templates/patroni.yml.j2

@@ -90,7 +90,7 @@ bootstrap:
       use_slots: true
       parameters:
       {% for parameter in postgresql_parameters %}
-        {{ parameter.option }}: {{ parameter.value }}
+        {{ parameter.option }}: "{{ parameter.value }}"
       {% endfor %}
     {% if patroni_standby_cluster.host is defined and patroni_standby_cluster.host | length > 0 %}
     standby_cluster: