Add missing xdg-user-dirs (#3484)

* Update cosmic.py

* Reverted incorrect Python logic surrounding the greeter type.

---------

Co-authored-by: Torxed <torxed@archlinux.org>

archinstall/default_profiles/desktops/cosmic.py

@@ -12,7 +12,8 @@ class CosmicProfile(XorgProfile):
 	@override
 	def packages(self) -> list[str]:
 		return [
-			'cosmic',
+			"cosmic",
+			"xdg-user-dirs",
 		]
 
 	@property