fix: use SafeUrl as &str, jsonrpsee 0.20.0 fixed the issue

- the previous issue with jsonrpsee correctly parsing the &str from
  SafeUrl seems to be solved on the latest 0.20.0 release, as per the
  discussion and CHANGELOG: https://github.com/paritytech/jsonrpsee/blob/v0.20.x/CHANGELOG.md#changed-2
  and PR: paritytech/jsonrpsee#1172

fedimint-core/src/api.rs

@@ -726,13 +726,13 @@ impl JsonRpcClient for WsClient {
         return WsClientBuilder::default()
             .use_webpki_rustls()
             .max_concurrent_requests(u16::MAX as usize)
-            .build(url_to_string_with_default_port(url)) // Hack for default ports, see fn docs
+            .build(url.as_str()) // Hack for default ports, see fn docs
             .await;
 
         #[cfg(target_family = "wasm")]
         WsClientBuilder::default()
             .max_concurrent_requests(u16::MAX as usize)
-            .build(url_to_string_with_default_port(url)) // Hack for default ports, see fn docs
+            .build(url.as_str()) // Hack for default ports, see fn docs
             .await
     }
 
@@ -862,24 +862,6 @@ impl<C: JsonRpcClient> FederationPeer<C> {
     }
 }
 
-/// `jsonrpsee` converts the `SafeUrl` to a `&str` internally and then parses it
-/// as an `Uri`. Unfortunately the underlying `Url` type swallows ports that it
-/// considers default ports (e.g. 80 and 443 for HTTP(S)) which makes the `Uri`
-/// parsing fail in these cases. This function works around this limitation in a
-/// limited way (not fully standard compliant, but work for our use case).
-///
-/// See <https://github.com/paritytech/jsonrpsee/issues/554#issue-1048646896>
-fn url_to_string_with_default_port(url: &SafeUrl) -> String {
-    format!(
-        "{}://{}:{}{}",
-        url.scheme(),
-        url.host().expect("Asserted on construction"),
-        url.port_or_known_default()
-            .expect("Asserted on construction"),
-        url.path()
-    )
-}
-
 impl<C: JsonRpcClient> WsFederationApi<C> {}
 
 /// The status of a server, including how it views its peers