Clear PDAs now specify they are a crystal PDA in messenger (#76675)

## About The Pull Request

When you say "sent from my PDA" in messenger, if it's through a clear
PDA, it will instead say "Sent from my Crystal PDA". This is so the
recipient knows they are in the presence of a crystal pda.

## Why It's Good For The Game

Bragging rights for having a crystal PDA. Minor interaction I think
would be funny.

## Changelog

🆑
add: The 'Sent from my PDA' message is different for Clear PDAs now
(specifying they are crystal).
/🆑

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

@@ -824,3 +824,7 @@ GLOBAL_LIST_EMPTY(TabletMessengers) // a list of all active messengers, similar
 
 /obj/item/modular_computer/proc/Remove_Messenger()
 	GLOB.TabletMessengers -= src
+
+///Returns a string of what to send at the end of messenger's messages.
+/obj/item/modular_computer/proc/get_messenger_ending()
+	return "Sent from my PDA"

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

@@ -119,7 +119,8 @@
 	screen_on = !screen_on
 	update_appearance()
 
-
+/obj/item/modular_computer/laptop/get_messenger_ending()
+	return "Sent from my UNIX Laptop"
 
 // Laptop frame, starts empty and closed.
 /obj/item/modular_computer/laptop/buildable

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

@@ -46,3 +46,6 @@
 
 /obj/item/modular_computer/processor/relay_qdel()
 	qdel(machinery_computer)
+
+/obj/item/modular_computer/processor/get_messenger_ending()
+	return "Sent from my Desktop"

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

@@ -432,3 +432,6 @@
 	if(theme_app)
 		for(var/theme_key in GLOB.pda_name_to_theme - GLOB.default_pda_themes)
 			theme_app.imported_themes += theme_key
+
+/obj/item/modular_computer/pda/clear/get_messenger_ending()
+	return "Sent from my crystal PDA"