[const.wrap.class] Add \exposidnc to cw-operators

Author: hewillk

source/meta.tex

@@ -834,7 +834,7 @@
 };
 
 template<@\exposid{cw-fixed-value}@ X, class>
-struct constant_wrapper : cw-operators {
+struct constant_wrapper : @\exposidnc{cw-operators}@ {
   static constexpr const auto & value = X.@\exposid{data}@;
   using type = constant_wrapper;
   using value_type = typename decltype(X)::@\exposid{type}@;