Centralize retained dialog destroy callbacks

src/legacy_ui_overlay_services.cpp

@@ -15,6 +15,11 @@ void initialize_legacy_overlay_node(App& app, Node& node)
     node.loaded();
 }
 
+void close_legacy_dialog_node(Node& node)
+{
+    node.destroy();
+}
+
 void configure_legacy_popup_overlay(Node& node) noexcept
 {
     node.m_mouse_ignore = false;
@@ -36,7 +41,7 @@ void close_legacy_popup_overlay(Node& node) noexcept
 
 void close_legacy_dialog_and_hide_keyboard(App& app, Node& node)
 {
-    node.destroy();
+    close_legacy_dialog_node(node);
     app.hideKeyboard();
 }