Ship Projectiles Hard Del (#22473)

Fix for a hard del caused by overmap projectiles failing to clear their
walk cycle and timers consistently. This hard delete is relatively rare,
except in any kind of event involving ship combat....

code/modules/overmap/ship_weaponry/projectiles/_overmap_projectiles.dm

@@ -26,7 +26,7 @@
 	x = sx
 	y = sy
 	z = SSatlas.current_map.overmap_z
-	addtimer(CALLBACK(src, PROC_REF(move_to)), 1)
+	addtimer(CALLBACK(src, PROC_REF(move_to)), 1, TIMER_STOPPABLE|TIMER_DELETE_ME)
 
 /obj/effect/overmap/projectile/Bump(var/atom/A)
 	if(istype(A, /turf/unsimulated/map/edge))
@@ -66,6 +66,7 @@
 	ammunition = null
 	target = null
 	entry_target = null
+	walk(src, 0)
 	return ..()
 
 /obj/effect/overmap/projectile/proc/prepare_for_entry()