RequestWorker: take unique ptr (fixes regression)

qswiki.cpp

@@ -137,7 +137,7 @@ int main(int argc, char **argv)
 		cache->clear();
 
 		HandlerFactory handlerFactory{config.handlersConfig, siteTemplate, *database.get(), urlProvider, *cache.get()};
-		RequestWorker requestWorker{handlerFactory, *database->createSessionDao().get(), siteTemplate};
+		RequestWorker requestWorker{handlerFactory, database->createSessionDao(), siteTemplate};
 
 		auto interface = createGateway(config);