LibWeb: Accept array pairs in URLSearchParams constructor

Author: https://github.com/Lubrsi
Commit: d7998c5dbd
Pull-request: https://github.com/SerenityOS/serenity/pull/12208
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/URL/URLSearchParams.idl

@@ -1,7 +1,7 @@
 interface URLSearchParams {
 
   // FIXME: the real type of init is (sequence<sequence<USVString>> or record<USVString, USVString> or USVString)
-  constructor(optional USVString init = "");
+  constructor(optional (sequence<sequence<USVString>> or USVString) init = "");
 
   undefined append(USVString name, USVString value);
   undefined delete(USVString name);