Avoid updater double initialization

Don't initialize the updater twice when logged in.

When the session is first loaded, only initialize the updater if there
are no logged in users in the session. If there are, the updater will
be initialized by the watcher.

Fix #1307

h/js/controllers.coffee

@@ -69,7 +69,8 @@ class App
 
     session.$promise.then (data) ->
       angular.extend $scope.model, data
-      $scope.initUpdater()
+      unless data.personas?.length
+        $scope.initUpdater()
 
     # Update scope with auto-filled form field values
     $timeout ->