On Wayland send Focused(false) for new window

On Wayland winit will always get an explicit focused event from the
system and will transfer it downstream. So send focused false to enforce
it.

src/platform_impl/linux/wayland/window/mod.rs

@@ -254,6 +254,12 @@ impl Window {
 
         winit_state.window_map.insert(window_id, window_handle);
 
+        // On Wayland window doesn't have Focus by default and it'll get it later on. So be
+        // explicit here.
+        winit_state
+            .event_sink
+            .push_window_event(crate::event::WindowEvent::Focused(false), window_id);
+
         winit_state
             .window_updates
             .insert(window_id, WindowUpdate::new());