Pull out asset handler refactor from https://github.com/DioxusLabs/dioxus/pull/2972 (#3000)

packages/desktop/src/webview.rs

@@ -188,7 +188,7 @@ impl WebviewInstance {
 
         let mut web_context = WebContext::new(cfg.data_dir.clone());
         let edit_queue = WryQueue::default();
-        let asset_handlers = AssetHandlerRegistry::new(dom.runtime());
+        let asset_handlers = AssetHandlerRegistry::new();
         let edits = WebviewEdits::new(dom.runtime(), edit_queue.clone());
         let file_hover = NativeFileHover::default();
         let headless = !cfg.window.window.visible;