Fixes machines not registering on new area's powernet when it is created (#26985)

* Machines are now moved to the new power net when a new area is created where they are

* Moves the machine reregistration to /turf/proc/change_area(area/old_area, area/new_area)

code/modules/lighting/lighting_turf.dm

@@ -98,6 +98,8 @@
 				lighting_build_overlay()
 			else
 				lighting_clear_overlay()
+	for(var/obj/machinery/machine in contents)
+		machine.reregister_machine()
 
 /turf/proc/generate_missing_corners()
 	if(!IS_DYNAMIC_LIGHTING(src) && !light_sources)