LibWeb: Make HTML::Window::page() return a Page&

Author: https://github.com/awesomekling
Commit: 9793d69d4f
Pull-request: https://github.com/SerenityOS/serenity/pull/22299
Issue: https://github.com/SerenityOS/serenity/issues/22290
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/Lubrsi

Userland/Libraries/LibWeb/CSS/Screen.cpp

@@ -40,7 +40,7 @@ void Screen::visit_edges(Cell::Visitor& visitor)
 
 Gfx::IntRect Screen::screen_rect() const
 {
-    auto screen_rect_in_css_pixels = window().page()->web_exposed_screen_area();
+    auto screen_rect_in_css_pixels = window().page().web_exposed_screen_area();
     return {
         screen_rect_in_css_pixels.x().to_int(),
         screen_rect_in_css_pixels.y().to_int(),