fix(cli): list-sessions stderr on fail (#1174)

Change `list-sessions` to report an error `1` on the shell
and put the output to stderr,
this can be valuable for scriping and should be consistent with expectations

src/sessions.rs

@@ -133,8 +133,8 @@ pub(crate) fn list_sessions() {
             0
         }
         Ok(_) => {
-            println!("No active zellij sessions found.");
+            eprintln!("No active zellij sessions found.");
-            0
+            1
         }
         Err(e) => {
             eprintln!("Error occurred: {:?}", e);