Fixes pylon lesser drone numbers (#4294)

# About the pull request

It's neat that this isn't picked up by the compiler. Never even
considered it.

# Explain why it's good for the game

Bug bad


# Testing Photographs and Procedure
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<summary>Screenshots & Videos</summary>

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# Changelog

:cl: Morrow
fix: Fixed lesser drone counts on pylons/cores
/:cl:

code/modules/cm_aliens/structures/special/pylon_core.dm

@@ -63,7 +63,7 @@
 	. = ..()
 
 	var/lesser_count = 0
-	for(var/mob/living/carbon/xenomorph/lesser_drone in linked_hive.totalXenos)
+	for(var/mob/living/carbon/xenomorph/lesser_drone/lesser in linked_hive.totalXenos)
 		lesser_count++
 
 	. += "Currently holding [SPAN_NOTICE("[Floor(lesser_drone_spawns)]")]/[SPAN_NOTICE("[lesser_drone_spawn_limit]")] lesser drones."