Fix reject regression (#14931)

This PR solves the regression introduced by #14622 (sorry about that).
It also adds a test to cover the regression.
Closes #14929.

crates/nu-command/tests/commands/reject.rs

@@ -178,3 +178,10 @@ fn test_ignore_errors_flag_var() {
         nu!("let arg = [5 c]; [[a, b]; [1, 2], [3, 4], [5, 6]] | reject ...$arg -i | to nuon");
     assert_eq!(actual.out, "[[a, b]; [1, 2], [3, 4], [5, 6]]");
 }
+
+#[test]
+fn test_works_with_integer_path_and_stream() {
+    let actual = nu!("[[N u s h e l l]] | flatten | reject 1 | to nuon");
+
+    assert_eq!(actual.out, "[N, s, h, e, l, l]");
+}