LibDevTools: Support inspecting DOM node box models and computed styles

Author: https://github.com/trflynn89
Commit: afb0a0a394
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3666
Reviewed-by: https://github.com/AtkinsSJ

Libraries/LibDevTools/Actors/TabActor.cpp

@@ -76,6 +76,7 @@ JsonObject TabActor::serialize_description() const
 void TabActor::reset_selected_node()
 {
     devtools().delegate().clear_highlighted_dom_node(description());
+    devtools().delegate().clear_inspected_dom_node(description());
 }
 
 }