Ports some hud and update_icon code updates.

code/_onclick/hud/devil.dm

@@ -9,11 +9,13 @@
 	using = new /obj/screen/drop()
 	using.icon = ui_style
 	using.screen_loc = ui_drone_drop
+	using.hud = src
 	static_inventory += using
 
 	pull_icon = new /obj/screen/pull()
 	pull_icon.icon = ui_style
-	pull_icon.update_icon(mymob)
+	pull_icon.hud = src
+	pull_icon.update_icon()
 	pull_icon.screen_loc = ui_drone_pull
 	static_inventory += pull_icon
 
@@ -26,6 +28,7 @@
 	using.screen_loc = ui_swaphand_position(owner,1)
 	using.layer = HUD_LAYER
 	using.plane = HUD_PLANE
+	using.hud = src
 	static_inventory += using
 
 	using = new /obj/screen/inventory()
@@ -35,14 +38,19 @@
 	using.screen_loc = ui_swaphand_position(owner,2)
 	using.layer = HUD_LAYER
 	using.plane = HUD_PLANE
+	using.hud = src
 	static_inventory += using
 
 	zone_select = new /obj/screen/zone_sel()
 	zone_select.icon = ui_style
-	zone_select.update_icon(mymob)
+	zone_select.hud = src
+	zone_select.update_icon()
 
 	lingchemdisplay = new /obj/screen/ling/chems()
+	lingchemdisplay.hud = src
+
 	devilsouldisplay = new /obj/screen/devil/soul_counter
+	devilsouldisplay.hud = src
 	infodisplay += devilsouldisplay