[apps] Display the baterry icon view on the title bar

Change-Id: I3a1f2540151f7ecbfafaead346e673f694d8c0dd

apps/apps_container.cpp

@@ -57,6 +57,8 @@ bool AppsContainer::handleEvent(Ion::Events::Event event) {
 
 void AppsContainer::switchTo(App * app) {
   m_window.setTitle(app->name());
+  // TODO: Update the battery icon every in a time frame
+  m_window.updateBatteryLevel();
   Container::switchTo(app);
 }