Use the gtk3 toolkit in the sugar-activity

Signed-off-by: Simon Schampijer <simon@laptop.org>
Acked-by: Daniel Drake <dsd@laptop.org>

bin/sugar-activity

@@ -25,10 +25,9 @@ import dbus
 import dbus.service
 import dbus.glib
 
-import sugar
-from sugar.activity import activityhandle
-from sugar.bundle.activitybundle import ActivityBundle
-from sugar import logger
+from sugar3.activity import activityhandle
+from sugar3.bundle.activitybundle import ActivityBundle
+from sugar3 import logger
 
 
 def create_activity_instance(constructor, handle):