Add missing #[test] to cookie save/load roundtrip

crates/obscura-net/src/cookies.rs

@@ -743,6 +743,7 @@ mod tests {
         let url = Url::parse("https://example.com/").unwrap();
         assert!(jar.get_cookie_header(&url).is_empty());
     }
+    #[test]
     fn test_save_load_roundtrip() {
         let tmp = tempfile::tempdir().unwrap();
         let path = tmp.path().join("cookies.json");