Centralize retained dialog close bindings

src/node_settings.cpp

@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "log.h"
+#include "legacy_ui_overlay_services.h"
 #include "node_settings.h"
 #include "layout.h"
 
@@ -16,7 +17,7 @@ void NodeSettings::init()
     SetPositioning(YGPositionTypeAbsolute);
     add_child_file("data/dialogs/settings.xml", "settings");
     btnOk = find<NodeButton>("btn-ok");
-    btnOk->on_click = [&](Node*) { destroy(); };
+    pp::panopainter::bind_legacy_click_destroys_node(*btnOk, *this);
 }
 
 kEventResult NodeSettings::handle_event(Event* e)