Update src/npctalk.cpp

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: Maleclypse

src/npctalk.cpp

@@ -3506,7 +3506,7 @@ talk_effect_fun_t::func f_add_trait( const JsonObject &jo, std::string_view memb
             const auto &existing_types = existing->types;
             for( const std::string &t : existing_types ) {
                 bool match = false;
-                if constexpr( std::is_same<decltype(new_types), const std::set<std::string> &>::value ) {
+                if constexpr( std::is_same<decltype( new_types ), const std::set<std::string> &>::value ) {
                     match = new_types.count( t ) > 0;
                 } else {
                     match = std::find( new_types.begin(), new_types.end(), t ) != new_types.end();