[MIRROR] Consolidates some /Destroy()s to make them properly delete (#10171)

Co-authored-by: Cameron Lennox <killer65311@gmail.com>
Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>

code/controllers/subsystems/mobs.dm

@@ -97,7 +97,3 @@ SUBSYSTEM_DEF(mobs)
 /datum/controller/subsystem/mobs/critfail()
 	..()
 	log_recent()
-
-/mob/Destroy()
-	. = ..()
-	SSmobs.currentrun -= src

code/controllers/subsystems/radiation.dm

@@ -146,7 +146,3 @@ SUBSYSTEM_DEF(radiation)
 		return
 	var/turf/epicentre = locate(round(world.maxx / 2), round(world.maxy / 2), source.z)
 	flat_radiate(epicentre, power, world.maxx, respect_maint)
-
-/mob/living/Destroy()
-	. = ..()
-	SSradiation.listeners -= src