revert: PR 866 (#927)

Author: SteveLauC

src/steps/os/unix.rs

@@ -786,18 +786,5 @@ pub fn run_maza(ctx: &ExecutionContext) -> Result<()> {
 pub fn reboot() -> Result<()> {
     print!("{}", t!("Rebooting..."));
 
-    cfg_if::cfg_if! {
-        if #[cfg(target_os = "linux")] {
-            // Per this doc: https://www.freedesktop.org/software/systemd/man/latest/sd_booted.html
-            //
-            // If this directory exists, then this Linux uses systemd as the init program.
-            let systemd_dir = Path::new("/run/systemd/system");
-            if let Ok(true) = systemd_dir.try_exists() {
-                // On Linux with systemd, `reboot` can be invoded without `sudo`.
-                return Command::new("reboot").status_checked();
-            }
-        }
-    }
-
     Command::new("sudo").arg("reboot").status_checked()
 }