Fix autoloading for solar arrays

This autoloads the node above a solar array, so that its light value can be determined.
Previously, solar arrays in unloaded blocks would report an input of 0 to the switching station.

technic/machines/register/solar_array.lua

@@ -17,6 +17,8 @@ function technic.register_solar_array(data)
 		pos1.y = pos.y + 1
 		pos1.x = pos.x
 		pos1.z = pos.z
+
+		technic.get_or_load_node(pos1)
 		local light = minetest.get_node_light(pos1, nil)
 		local time_of_day = minetest.get_timeofday()
 		local meta = minetest.get_meta(pos)