Player: Remove Initialization test

When constucting Player in the Sandbox, it tries to use X-11
for dbus-autolaunch which is disabled in the flatpak environment.

It fails with the following error:
D-Bus error: Using X11 for dbus-daemon autolaunch was disabled at compile time, set your DBUS_SESSION_BUS_ADDRESS instead (org.freedesktop.DBus.Error.NotSupported)

podcasts-gtk/src/main.rs

@@ -171,7 +171,6 @@ fn test_stuff() -> Result<(), failure::Error> {
 
     appnotif::InAppNotification::default();
     show_menu::ShowMenu::default();
-    player::PlayerWidget::default();
 
     Ok(())
 }