Fix #145 caused by #142 Make new feature opt-in (#146)

* Update default_settings.lua and settingtypes.txt
- Make new vertical behaviour opt-in
- crop comment

default_settings.lua

@@ -31,7 +31,7 @@ local settings = {
 	delete_item_on_clearobject = true,
 	use_real_entities = true,
 	entity_update_interval = 0,
-	enable_vertical_digilines_connectivity = true,
+	enable_vertical_digilines_connectivity = false,
 }
 
 pipeworks.toggles = {}