posix_sitl_default.cmake: add template module

Just to make sure it's built with CI

cmake/configs/posix_sitl_default.cmake

@@ -180,6 +180,9 @@ set(config_module_list
 	# https://px4.io/dev/example_fixedwing_control
 	examples/fixedwing_control
 
+	# Template Module
+	templates/module
+
 	# Hardware test
 	#examples/hwtest
 )