Fixes supermatter anomalies being able to drop anomaly cores. (#93611)

## About The Pull Request
Readds the drops_core argument for determining whether an anomaly is
capable of dropping a core through any means possible.

## Why It's Good For The Game
For intended behaviour of the supermatter.

## Changelog

🆑
fix: Supermatter anomalies no longer drop anomaly cores.
fix: Fix supermatter flux anomalies from sm delam not emping or
whatever.
/🆑

code/game/objects/effects/anomalies/_anomalies.dm

@@ -24,7 +24,7 @@
 	///Chance per second that we will move
 	var/move_chance = ANOMALY_MOVECHANCE
 
-/obj/effect/anomaly/Initialize(mapload, new_lifespan)
+/obj/effect/anomaly/Initialize(mapload, new_lifespan, drops_core = TRUE)
 	. = ..()
 
 	if(!mapload)
@@ -36,6 +36,9 @@
 	if (!impact_area)
 		return INITIALIZE_HINT_QDEL
 
+	if(!drops_core)
+		anomaly_core = null
+
 	if(anomaly_core)
 		anomaly_core = new anomaly_core(src)
 		anomaly_core.code = rand(1,100)