Fix memory leak in extension::GUI ScrollView. (#2821)

Fix memory leak in ScrollView.

_animatedScrollAction is retained but was not released on destruction
of the ScrollView.

Author: j-jorge

extensions/GUI/src/GUI/ScrollView/ScrollView.cpp

@@ -67,7 +67,11 @@ ScrollView::ScrollView()
     , _animatedScrollAction(nullptr)
 {}
 
-ScrollView::~ScrollView() {}
+ScrollView::~ScrollView()
+{
+    if (_animatedScrollAction)
+        _animatedScrollAction->release();
+}
 
 ScrollView* ScrollView::create(Size size, Node* container /* = nullptr*/)
 {