scripted-diff: Use ser params operator

-BEGIN VERIFY SCRIPT-
 sed -i 's|WithParams(\([a-zA-Z:._]\+\), |\1(|g' $( git grep -l WithParams )
-END VERIFY SCRIPT-

src/test/fuzz/util.h

@@ -107,7 +107,7 @@ template <typename T, typename P>
     DataStream ds{buffer};
     T obj;
     try {
-        ds >> WithParams(params, obj);
+        ds >> params(obj);
     } catch (const std::ios_base::failure&) {
         return std::nullopt;
     }