Fix typo

This is what I get for not proofreading

scripts/synapse_port_db

@@ -40,7 +40,7 @@ BOOLEAN_COLUMNS = {
     "presence_list": ["accepted"],
     "presence_stream": ["currently_active"],
     "public_room_list_stream": ["visibility"],
-    "device_list_outbound_pokes": ["sent"],
+    "device_lists_outbound_pokes": ["sent"],
 }