Fix using the wrong id for insertStatic

apps/openmw/mwworld/esmstore.hpp

@@ -249,17 +249,14 @@ namespace MWWorld
         template <class T>
         const T *insertStatic(const T &x)
         {
-            const std::string id = "$dynamic" + std::to_string(mDynamicCount++);
-
             Store<T> &store = const_cast<Store<T> &>(get<T>());
-            if (store.search(id) != nullptr)
+            if (store.search(x.mId) != nullptr)
             {
-                const std::string msg = "Try to override existing record '" + id + "'";
+                const std::string msg = "Try to override existing record '" + x.mId + "'";
                 throw std::runtime_error(msg);
             }
-            T record = x;
 
-            T *ptr = store.insertStatic(record);
+            T *ptr = store.insertStatic(x);
             for (iterator it = mStores.begin(); it != mStores.end(); ++it) {
                 if (it->second == &store) {
                     mIds[ptr->mId] = it->first;