Use updateConfig addons instead of manifest addons to setup

Even though app.manifest variable is updated by updatedApp, the
setupAddons is called with the _old_ value because it is a bind()

src/apptask.js

@@ -652,7 +652,7 @@ function update(app, callback) {
         downloadIcon.bind(null, app),
 
         updateApp.bind(null, app, { installationProgress: '70, Updating addons' }),
-        addons.setupAddons.bind(null, app, app.manifest.addons),
+        addons.setupAddons.bind(null, app, app.updateConfig.manifest.addons),
 
         updateApp.bind(null, app, { installationProgress: '80, Creating container' }),
         createContainer.bind(null, app),