Adds a new App for Modular Computers, the NTOS Arcade. (#47862)

Hey you, punk Are you hip with modular computers?
...What's that, you think there's nothing to do on that old tablet of yours? Whoah brochacho, don't dump that tablet in the trash, and check out the new gaming app that's sweeping the station!

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

@@ -37,6 +37,8 @@
 	if (!ui)
 		var/datum/asset/assets = get_asset_datum(/datum/asset/simple/headers)
 		assets.send(user)
+		assets = get_asset_datum(/datum/asset/simple/arcade)
+		assets.send(user)
 		ui = new(user, src, ui_key, "ntos_main", "NtOS Main menu", 400, 500, master_ui, state)
 		ui.open()
 		ui.set_autoupdate(state = 1)

code/modules/modular_computers/computers/machinery/console_presets.dm

@@ -77,3 +77,4 @@
 	var/obj/item/computer_hardware/hard_drive/hard_drive = cpu.all_components[MC_HDD]
 	hard_drive.store_file(new/datum/computer_file/program/chatclient())
 	hard_drive.store_file(new/datum/computer_file/program/nttransfer())
+	hard_drive.store_file(new/datum/computer_file/program/arcade())