remove wait_prelogin

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

src/platform/linux.rs

@@ -467,7 +467,7 @@ pub fn get_env_var(k: &str) -> String {
     }
 }
 
-// Headless is enabled, no need to wait prelogin.
+// Headless is enabled, always return true.
 pub fn is_prelogin() -> bool {
     let n = get_active_userid().len();
     n < 4 && n > 1