Remove app top level star imports

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/smart_settings/apps.py

@@ -4,7 +4,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.common.apps import MayanAppConfig
 from mayan.apps.common.menus import menu_secondary, menu_setup, menu_object
-from mayan.apps.navigation import SourceColumn
+from mayan.apps.navigation.classes import SourceColumn
 
 from .classes import Namespace, Setting
 from .links import (