fix xpanes doompane texture - by auouYmous

mods/scifi_nodes/panes.lua

 xpanes.register_pane("doompane", {
 	description = "Doom pane",
-	tiles = {"xpanes_space.png"},
+	tiles = {"scifi_nodes_doompane.png"},
 	drawtype = "airlike",
 	paramtype = "light",
 	is_ground_content = false,