Add window::Settings::maximized

Corresponds to `winit:🪟:WindowAttributes::with_maximized`

winit/src/conversion.rs

@@ -23,6 +23,7 @@ pub fn window_attributes(
             width: settings.size.width,
             height: settings.size.height,
         })
+        .with_maximized(settings.maximized)
         .with_resizable(settings.resizable)
         .with_enabled_buttons(if settings.resizable {
             winit::window::WindowButtons::all()