PAI overlay on PDAs (#71602)

## About The Pull Request
Adds a small overlay when pais are inserted into your pda


![image](https://user-images.githubusercontent.com/73374039/204449843-1e8b91ea-e2d1-46c2-8f8a-05ded8fbc0d7.png)


![image](https://user-images.githubusercontent.com/73374039/204449876-4e4d649a-1246-47a2-b693-bc7af931c85e.png)
## Why It's Good For The Game
This was another legacy feature that was removed with modpdas, and other
servers (like bee, though i personally dont agree with the creator.)
have it already. sooooo why not make one for tg
## Changelog
🆑
imageadd: indicator when a pda contains a pai
/🆑

Co-authored-by: etherware-novice <candy@notarealaddr.com>

code/modules/modular_computers/computers/item/computer_ui.dm

@@ -192,6 +192,7 @@
 					usr.put_in_hands(inserted_pai)
 					to_chat(usr, span_notice("You remove [inserted_pai] from the [name]."))
 					inserted_pai = null
+					update_appearance(UPDATE_ICON)
 				if("interact")
 					inserted_pai.attack_self(usr)
 			return UI_UPDATE