Fix missing map program overlay for PDAs (#22353)

Fixes PDA sprites missing an overlay when the map program is loaded.
Sprites drawn by myself based on the DOOM automap and a very poor
attempt to model the E1M1 entry room.


https://github.com/user-attachments/assets/3a2d8c2f-9ff7-4f46-a63a-c38cf52f3615

- Fixes #22250

code/modules/modular_computers/file_system/programs/generic/map.dm

@@ -3,8 +3,7 @@
 	filedesc = "Map Program"
 	extended_desc = "This program may be used to see the decks or levels of the vessel, station, or ship."
 	program_icon_state = "map"
-	program_key_icon_state = "lightblue_key"
-	color = LIGHT_COLOR_BLUE
+	program_key_icon_state = "black_key"
 	size = 4
 	requires_ntnet = TRUE
 	available_on_ntnet = TRUE