Fixed the multiple window closing issue, where the two multiwindow examples weren't working. (#3499)

* fixed window when multiple windows not closing

* fixed window when multiple windows not closing

* fixed accidental includes

* polished

* fix last window closing hiding app and rc hardcount

* find the suspect strong count holders and fix them

* Use the proper type alias

* fmt

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

examples/multiwindow.rs

@@ -5,9 +5,13 @@
 //! own context, root elements, etc.
 
 use dioxus::prelude::*;
+use dioxus::{desktop::Config, desktop::WindowCloseBehaviour};
 
 fn main() {
-    dioxus::LaunchBuilder::desktop().launch(app);
+    dioxus::LaunchBuilder::desktop()
+        // We can choose the close behavior of the last window to hide. See WindowCloseBehaviour for more options.
+        .with_cfg(Config::new().with_close_behaviour(WindowCloseBehaviour::LastWindowHides))
+        .launch(app);
 }
 
 fn app() -> Element {