replace pkexec with gtk sudo (#9383)

* Fix https://github.com/rustdesk/rustdesk/issues/9286, replace pkexec
  with gtk sudo. Tested on gnome (ubuntu 22.04, debian 13), xfce (manjaro, suse), kde (kubuntu 23), lxqt (lubuntu 22), Cinnamon (mint 21.3), Mate (mint 21.2)
* Fix incorrect config of the main window opened by the tray, replace
  xdg-open with run_me, replace with dbus + run_me
* Fix `check_if_stop_service`, it causes the problem fixed in
  https://github.com/rustdesk/rustdesk/pull/8414, now revert that fix and fix itself.

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/platform/mod.rs

@@ -23,6 +23,9 @@ pub mod linux;
 #[cfg(target_os = "linux")]
 pub mod linux_desktop_manager;
 
+#[cfg(target_os = "linux")]
+pub mod gtk_sudo;
+
 #[cfg(not(any(target_os = "android", target_os = "ios")))]
 use hbb_common::{message_proto::CursorData, ResultType};
 use std::sync::{Arc, Mutex};