Adds cool sword mouse cursor maintenance pda app (#84337)

## About The Pull Request

Adds a maintenance disk that makes your PDA turn your mouse cursor into
a cool sword when it's worn in your ID slot


https://github.com/tgstation/tgstation/assets/51863163/ae5c50a1-e6fd-40bb-8957-4af2f6618cba

## Why It's Good For The Game

I saw a discord comment about this and it made me laugh.

## Changelog

🆑 Melberte
add: Cool Sword Cursor Maintenance App
/🆑

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

@@ -39,7 +39,7 @@
 	stored_files.Remove(file_removing)
 	used_capacity -= file_removing.size
 	SEND_SIGNAL(src, COMSIG_MODULAR_COMPUTER_FILE_DELETE, file_removing)
-	SEND_SIGNAL(file_removing, COMSIG_COMPUTER_FILE_DELETE)
+	SEND_SIGNAL(file_removing, COMSIG_COMPUTER_FILE_DELETE, src)
 	qdel(file_removing)
 	return TRUE
 

code/modules/modular_computers/computers/item/disks/maintenance_disks.dm

@@ -25,3 +25,6 @@
 /obj/item/computer_disk/maintenance/theme/Initialize(mapload)
 	starting_programs = list(pick(subtypesof(/datum/computer_file/program/maintenance/theme)))
 	return ..()
+
+/obj/item/computer_disk/maintenance/cool_sword
+	starting_programs = list(/datum/computer_file/program/maintenance/cool_sword)