Reinstate metered conection checking

src/main.py

@@ -3,6 +3,7 @@
 
 import initialization  # noqa: F401 keep this first, to ensure we're set up for other imports
 from android_utils import get_dummy_user_name
+from android_utils import is_active_network_metered
 from android_utils import share_by_intent
 from jnius import autoclass
 from kolibri.main import enable_plugin
@@ -15,8 +16,6 @@
 from magicbus.plugins import SimplePlugin
 from runnable import Runnable
 
-# from android_utils import is_active_network_metered
-
 
 PythonActivity = autoclass("org.kivy.android.PythonActivity")
 
@@ -57,7 +56,7 @@ def SERVING(self, port):
 initialize()
 
 interface.register(share_file=share_by_intent)
-# interface.register(check_is_metered=is_active_network_metered)
+interface.register(check_is_metered=is_active_network_metered)
 interface.register(get_os_user=os_user)
 
 kolibri_bus = BaseKolibriProcessBus()