Fix improper parsing of pgsql_replica_method

Directly parsing key and value from array of hashes won't work, we need
to first iterate through array and then split key and value in each
array member

templates/postgresql.yml.erb

@@ -130,13 +130,15 @@ postgresql:
 <% end -%>
 <% unless @pgsql_replica_method.empty? -%>
   replica_method:
-<% @pgsql_replica_method.each do |name,settings| -%>
+<% @pgsql_replica_method.each do |replica_method| -%>
+<% replica_method.each do |name, settings| -%>
     <%= name -%>:
 <% settings.each do |setname,setval| -%>
       <%= setname -%>: <%= setval %>
 <% end -%>
 <% end -%>
 <% end -%>
+<% end -%>
 
 restapi:
   listen: <%= @restapi_listen %>