Make server announcement OOC [NO GBP] (#80741)

## About The Pull Request

Makes the server admin announcement use tgchat's OOC colors and stops
using announcement.ogg, so players don't mistake it for a Centcom
announcement.


![image](https://github.com/tgstation/tgstation/assets/83487515/32b965a3-58df-45d5-9238-fdb954c8448e)


![image](https://github.com/tgstation/tgstation/assets/83487515/3174d8c9-4194-4a96-844b-d92a6723dce2)

## Why It's Good For The Game

Melbert was right.

## Changelog

🆑 LT3
fix: OOC announcements will now be in shown in OOC colors
/🆑

code/modules/admin/verbs/admin.dm

@@ -37,7 +37,7 @@
 	if(message)
 		if(!check_rights(R_SERVER,0))
 			message = adminscrub(message,500)
-		send_formatted_announcement(message, "From [usr.client.holder.fakekey ? "Administrator" : usr.key]")
+		send_ooc_announcement(message, "From [usr.client.holder.fakekey ? "Administrator" : usr.key]")
 		log_admin("Announce: [key_name(usr)] : [message]")
 	BLACKBOX_LOG_ADMIN_VERB("Announce")