build-remote: Don't substitute the build result

src/build-remote/build-remote.cc

@@ -244,7 +244,7 @@ connected:
         if (!missing.empty()) {
             Activity act(*logger, lvlTalkative, actUnknown, fmt("copying outputs from '%s'", storeUri));
             store->locksHeld.insert(missing.begin(), missing.end()); /* FIXME: ugly */
-            copyPaths(ref<Store>(sshStore), store, missing, NoRepair, NoCheckSigs, substitute);
+            copyPaths(ref<Store>(sshStore), store, missing, NoRepair, NoCheckSigs, NoSubstitute);
         }
 
         return;