fix: enable the cosmic-greeter service (#4023)

Author: Mariya

archinstall/lib/profile/profiles_handler.py

@@ -206,6 +206,7 @@ def install_greeter(self, install_session: 'Installer', greeter: GreeterType) ->
 				service_disable = ['getty@tty1']
 			case GreeterType.CosmicSession:
 				packages = ['cosmic-greeter']
+				service = ['cosmic-greeter']
 
 		if packages:
 			install_session.add_additional_packages(packages)