Do not send all windows below the dialog when window type is AppletPopup

When a dialog is created with the AppletPopup type, do not send all windows below, otherwise also tooltips would be overlapped (on Wayland).

This line was added in https://invent.kde.org/frameworks/plasma-framework/-/commit/799121e70badd73379b539af1259ed10527da280. I tested the pin feature and it seems to be properly working.