Fix clippy warning about ok_or() followed by a function call

warning: use of `ok_or` followed by a function call
   --> src/lib.rs:379:10
    |
379 |         .ok_or(tungstenite::Error::Url("Url scheme not supported".into()))
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `ok_or_else(|| tungstenite::Error::Url("Url scheme not supported".into()))`

src/lib.rs

@@ -376,5 +376,5 @@ pub(crate) fn port(
             Some("ws") => Some(80),
             _ => None,
         })
-        .ok_or(tungstenite::Error::Url("Url scheme not supported".into()))
+        .ok_or_else(|| tungstenite::Error::Url("Url scheme not supported".into()))
 }