servo: Merge #5717 - Fix URLSearchParams formatting (from Ms2ger:usp); r=jdm

Source-Repo: https://github.com/servo/servo
Source-Revision: e26219828bfd71c5dfce411f93f2ea5dbb131d7a

servo/components/script/dom/urlsearchparams.rs

@@ -140,7 +140,7 @@ impl URLSearchParamsHelpers for URLSearchParams {
 
                     // Encode everything else using 'percented-encoded bytes'
                     // https://url.spec.whatwg.org/#percent-encode
-                    a => format!("%{:X}", a).into_bytes(),
+                    a => format!("%{:02X}", a).into_bytes(),
                 };
                 buf.push_all(&append);
             }