Fix power monitor instability (#654)

This fixes the power monitor instability where it was switching between having and not having network infotext. The cause was that the power monitor is LV MV and HV machine at the same time, and each tier has a countdown. If any of these countdowns were 0 it treated the machine as having no network. This was changed so that it only treats a machine as having no network if it is timed out in all tiers that it is a part of.

technic/machines/switching_station.lua

@@ -468,22 +468,29 @@ minetest.register_abm({
 	interval   = 1,
 	chance     = 1,
 	action = function(pos, node, active_object_count, active_object_count_wider)
+		local has_network = false
+		local technic_machine = false
 		for tier, machines in pairs(technic.machines) do
-			if machines[node.name] and switching_station_timeout_count(pos, tier) then
-				local nodedef = minetest.registered_nodes[node.name]
-				if nodedef then
-					local meta = minetest.get_meta(pos)
-					meta:set_string("infotext", S("%s Has No Network"):format(nodedef.description))
-				end
-				if nodedef and nodedef.technic_disabled_machine_name then
-					node.name = nodedef.technic_disabled_machine_name
-					minetest.swap_node(pos, node)
-				end
-				if nodedef and nodedef.technic_on_disable then
-					nodedef.technic_on_disable(pos, node)
+			if machines[node.name] then
+				technic_machine = true
+				if not switching_station_timeout_count(pos, tier) then
+					has_network = true
 				end
 			end
 		end
+
+		if technic_machine and not has_network then
+			local nodedef = minetest.registered_nodes[node.name]
+			local meta = minetest.get_meta(pos)
+			meta:set_string("infotext", S("%s Has No Network"):format(nodedef.description))
+			if nodedef.technic_disabled_machine_name then
+				node.name = nodedef.technic_disabled_machine_name
+				minetest.swap_node(pos, node)
+			end
+			if nodedef.technic_on_disable then
+				nodedef.technic_on_disable(pos, node)
+			end
+		end
 	end,
 })