LibWeb: Add missing virtual destructor in AnimationEffect

Author: https://github.com/mattco98
Commit: df4be9a479
Pull-request: https://github.com/SerenityOS/serenity/pull/23079
Reviewed-by: https://github.com/AtkinsSJ ✅

Userland/Libraries/LibWeb/Animations/AnimationEffect.h

@@ -132,6 +132,7 @@ public:
 
 protected:
     AnimationEffect(JS::Realm&);
+    virtual ~AnimationEffect() = default;
 
     virtual void initialize(JS::Realm&) override;