Fix issues discovered via TypeMaker (#87596)

## About The Pull Request
Fixes issues with var typing and proc arguments, discovered using
OpenDream's WIP TypeMaker feature (using improvements I haven't PR'd
upstream yet).

## Why It's Good For The Game
Codebase maintenance.

code/modules/mapfluff/ruins/spaceruin_code/hauntedtradingpost.dm

@@ -245,7 +245,7 @@
 	//is this being used as part of the haunted trading post ruin? if true, will self destruct when boss dies
 	var/donk_ai_slave = FALSE
 	// machine that the trap inhabits
-	var/obj/structure/host_machine
+	var/obj/machinery/host_machine
 	// turf that the trap is on
 	var/turf/my_turf
 	//how long until trap zaps everything, after it detects something