Clear PDA now has all themes (#76674)

## About The Pull Request

Gives all themes to clear PDAs

## Why It's Good For The Game

Clear PDAs are found/purchased late into a round and theme apps would
generally already be found and installed in PDAs. This means there's
nothing left to install in the crystal PDA, so instead I thought why
shouldn't they just get all themes?

## Changelog

🆑
qol: Clear PDAs now has all themes in their themify app by default.
/🆑

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

@@ -425,3 +425,10 @@
 	greyscale_config = null
 	greyscale_colors = null
 	long_ranged = TRUE
+
+/obj/item/modular_computer/pda/clear/Initialize(mapload)
+	. = ..()
+	var/datum/computer_file/program/themeify/theme_app = locate() in stored_files
+	if(theme_app)
+		for(var/theme_key in GLOB.pda_name_to_theme - GLOB.default_pda_themes)
+			theme_app.imported_themes += theme_key