[Balance] Hive weeds now look for a supporting structure (#4385)

# About the pull request

Similar to how weed sacs can support another sac's weeds within range,
add this to stronger weeds as well.

So if you have a cluster and a core close together, when one of them is
destroyed, the hive weeds that are still within the range of the other
structure will not disappear.

# Explain why it's good for the game

Feels weird that all weeds receded next to other clusters / core when
they can definitely support it.

Plus weak weeds can do it, why can't thick weeds?


# Changelog

:cl:
balance: Hive weeds can be supported by other structures when original
parent structure is destroyed.
/:cl:

---------

Co-authored-by: harryob <[email protected]>

code/modules/cm_aliens/weeds.dm

@@ -193,13 +193,16 @@
 // If you're still confused, scroll aaaall the way down to the bottom of the file.
 // that's /obj/effect/alien/weeds/node/Destroy().
 /obj/effect/alien/weeds/proc/avoid_orphanage()
-	for(var/obj/effect/alien/weeds/node/N in orange(node_range, get_turf(src)))
-		// WE FOUND A NEW MOMMY
-		N.add_child(src)
-		break
+	var/parent_type = /obj/effect/alien/weeds/node
+	if(weed_strength >= WEED_LEVEL_HIVE)
+		parent_type = /obj/effect/alien/weeds/node/pylon
+
+	var/obj/effect/alien/weeds/node/found = locate(parent_type) in orange(node_range, get_turf(src))
+	if(found)
+		found.add_child(src)
 
 	// NO MORE FOOD ON THE TABLE. WE DIE
-	if(!parent || weed_strength > WEED_LEVEL_STANDARD)
+	if(!parent)
 		qdel(src)
 
 /obj/effect/alien/weeds/proc/weed_expand()