Overmap Icon Fixes (#23050)

Adds the missing [!] to the gravity anomoly overmap icon and a new
psiren overmap icon, so they no longer share an icon with carp.

---------

Signed-off-by: Fyni <itsfyni@gmail.com>

code/modules/overmap/events/event.dm

@@ -343,7 +343,7 @@
 	name = "psiren shoal"
 	events = list(/datum/event/wandering_psirens/overmap)
 	difficulty = EVENT_LEVEL_MODERATE
-	event_icon_states = list("carp")
+	event_icon_states = list("psiren")
 	movable_event_chance = 30
 	tooltip_text = "Xenofauna: usually hostile."
 

html/changelogs/fyni-overmap.yml

@@ -0,0 +1,5 @@
+author: fyni
+delete-after: True
+changes:
+  - rscadd: "Adds the [!] to the gravity anomoly overmap icon."
+  - rscadd: "Adds a new psiren overmap icon, so they no longer share an icon with carp."