Miscellaneous appearance fixes. (#57133)

* Fixes modular computer runtimes

- Adds a proc to eat the source arg of the update icon signal.

* Fixes a couple things not passing the right args

- Fixes the alien leap hallucination passing a string as the first arg to updat_icon
- Fixes the roulette machine passing the payout as the first arg to update_icon.

code/modules/modular_computers/computers/item/processor.dm

@@ -38,7 +38,7 @@
 	integrity_failure = machinery_computer.integrity_failure
 	base_active_power_usage = machinery_computer.base_active_power_usage
 	base_idle_power_usage = machinery_computer.base_idle_power_usage
-	machinery_computer.RegisterSignal(src, COMSIG_ATOM_UPDATED_ICON, /atom/proc/update_icon) //when we update_icon, also update the computer
+	machinery_computer.RegisterSignal(src, COMSIG_ATOM_UPDATED_ICON, /obj/machinery/modular_computer/proc/relay_icon_update) //when we update_icon, also update the computer
 
 /obj/item/modular_computer/processor/relay_qdel()
 	qdel(machinery_computer)

code/modules/modular_computers/computers/machinery/modular_computer.dm

@@ -73,6 +73,11 @@
 		. += "bsod"
 		. += "broken"
 
+/// Eats the "source" arg because update_icon actually expects args now.
+/obj/machinery/modular_computer/proc/relay_icon_update(datum/source, updates, updated)
+	SIGNAL_HANDLER
+	return update_icon(updates)
+
 /obj/machinery/modular_computer/AltClick(mob/user)
 	if(cpu)
 		cpu.AltClick(user)