changed menu behavior in sams_hub.py according to issue #2

sams_classes/sams_hub.py

@@ -76,7 +76,10 @@ class SAMSHub:
   def menu(self, langCode):
     menu = []
     for app in self._apps.values():
-      menu.extend(app.menu(langCode))
+      if self._config.get('main_app') is app.name:
+        menu.extend(app.menu(langCode = langCode))
+      else:
+        menu.extend(app.menu(langCode = langCode, urlPrefix = app.name))
     return menu
   
   @staticmethod