nit_fader: update view visibility for late clients

The visibility of the client's view is re-evaluated at each animation
step. However, when the client appears long after the initial
fade-in/out animation is completed, the initial visibility state
remaines unchanged. This happens when booting the Sculpt scenario in
Qemu where the the nit_fb instances of the leitzentrale could not be
started in time. This patch fixes the issue by re-evaluating the view
visibility also at the view-creation time.

repos/gems/src/server/nit_fader/main.cc

@@ -348,6 +348,7 @@ class Nit_fader::Nitpicker_session_component
 		View_handle create_view(View_handle parent) override
 		{
 			_view_handle = _nitpicker.create_view(parent);
+			_update_view_visibility();
 			return _view_handle;
 		}