Hivebot Spawn Effect Tweak (#19600)

* Most hivebots now create sparks when they teleport in, instead of
smoke. The smokescreen created by beacons remain.
* Smoke now renders over mobs again.

code/game/objects/effects/chem/chemsmoke.dm

@@ -4,7 +4,6 @@
 /obj/effect/effect/smoke/chem
 	icon = 'icons/effects/chemsmoke.dmi'
 	opacity = 0
-	layer = ABOVE_PROJECTILE_LAYER
 	time_to_live = 300
 	pass_flags = PASSTABLE | PASSGRILLE | PASSGLASS //PASSGLASS is fine here, it's just so the visual effect can "flow" around glass
 	var/splash_amount = 10 //atoms moving through a smoke cloud get splashed with up to 10 units of reagent

code/game/objects/effects/effect_system.dm

@@ -97,6 +97,7 @@ steam.start() -- spawns the effect
 	name = "smoke"
 	icon_state = "smoke"
 	opacity = 1
+	layer = ABOVE_PROJECTILE_LAYER
 	anchored = 0.0
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	var/amount = 6.0