linux, refact desktop env

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/rendezvous_mediator.rs

@@ -54,8 +54,6 @@ impl RendezvousMediator {
     pub async fn start_all() {
         let mut nat_tested = false;
         check_zombie();
-        #[cfg(target_os = "linux")]
-        crate::server::check_xdesktop();
         let server = new_server();
         if Config::get_nat_type() == NatType::UNKNOWN_NAT as i32 {
             crate::test_nat_type();