Fix frontend update condition for time range

Author: ohinckel

frontend/jobs.py

@@ -202,7 +202,7 @@ def app_update(self, revision=None, force=False):
             _diff = utils.DateTime.midnight()-utils.DateTime.now(sub=_config.app_update_install_hour)
         else:
             _diff = -1
-        if force is False and _diff and (_diff.seconds < 0 or _diff.seconds > 2*60*60):
+        if force is False and _diff and (_diff < 0 or _diff > 2*60*60):
             return
         _capability = frontend.Frontend.get().get_device().get_capability()
         _config.app_update_check_date = None