Reduces the overmap psiren shoals (#23122)

As per the title. We're no longer in the sea after all.

code/modules/overmap/events/event.dm

@@ -430,14 +430,14 @@
 
 /datum/overmap_event/psiren
 	name = "psiren shoal"
-	count = 3
+	count = 1
 	radius = 1
 	continuous = FALSE
 	hazards = /obj/effect/overmap/event/psiren
 
 /datum/overmap_event/psiren/major
 	name = "psiren school"
-	count = 2
+	count = 1
 	radius = 2
 	opacity = 1
 	hazards = /obj/effect/overmap/event/psiren/major

html/changelogs/PsirenShaoReduction.yml

@@ -0,0 +1,6 @@
+author: TheGreyWolf
+
+delete-after: True
+
+changes:
+  - balance: "Reduced the number of overmap psiren shoals."