LibWeb: Destroy associated navigable when <object> is removed from DOM

Author: https://github.com/kalenikaliaksandr
Commit: 68440ed02d
Pull-request: https://github.com/SerenityOS/serenity/pull/23996

Userland/Libraries/LibWeb/HTML/HTMLObjectElement.h

@@ -36,6 +36,7 @@ public:
     virtual ~HTMLObjectElement() override;
 
     virtual void form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value) override;
+    virtual void form_associated_element_was_removed(DOM::Node*) override;
 
     String data() const;
     void set_data(String const& data) { MUST(set_attribute(HTML::AttributeNames::data, data)); }