make path exists work on expanded path (#5886)

* make path exists works with home

* fix test name

crates/nu-command/tests/commands/path/exists.rs

@@ -51,3 +51,9 @@ fn checks_if_double_dot_exists() {
         assert_eq!(actual.out, "true");
     })
 }
+
+#[test]
+fn checks_tilde_relative_path_exists() {
+    let actual = nu!(cwd: ".", "'~' | path exists");
+    assert_eq!(actual.out, "true");
+}