cinnamon-session-quit.py: Set logout window to keep-above and all-

workspaces.

This was inadvertently left out of 6.0 rewrite.

ref:
https://github.com/orgs/linuxmint/discussions/312

Author: mtwebster

cinnamon-session-quit/cinnamon-session-quit.py

@@ -285,6 +285,9 @@ def run_dialog(self):
 
         self.window.set_default_response(self.default_response)
         self.window.connect("response", self.handle_response)
+
+        self.window.set_keep_above(True)
+        self.window.stick()
         self.window.present_with_time(0)
 
     def get_session_capabilities(self):