fix: change type for non_active_slots count

Author: casperr0

mamonsu/plugins/pgsql/xlog.py

@@ -140,7 +140,7 @@ def triggers(self, template):
             'name': 'PostgreSQL number of non-active replication slots '
                     'on {HOSTNAME} (value={ITEM.LASTVALUE})',
             'expression': '{#TEMPLATE:' + self.right_type(self.key_replication, "sec") + '.last()}≠' +
-            NUMBER_NON_ACTIVE_SLOTS
+            str(NUMBER_NON_ACTIVE_SLOTS)
         })
         return triggers