Update DefaultVal.hpp

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: liuzicheng1987

include/rfl/DefaultVal.hpp

@@ -108,9 +108,10 @@ struct DefaultVal {
   /// Assigns the underlying object.
   template <class U>
   auto& operator=(DefaultVal<U>&& _field) {
-    value_ = std::forward<T>(_field.value_);
+    value_ = std::move(_field.value_);
     return *this;
   }
+  }
 
   /// Assigns the underlying object.
   void set(const Type& _value) { value_ = _value; }