Correctly destroy startup resume data storage

PR #17930.

src/base/bittorrent/sessionimpl.cpp

@@ -1387,7 +1387,7 @@ void SessionImpl::endStartup(ResumeSessionContext *context)
             saveTorrentsQueue();
 
         const Path dbPath = context->startupStorage->path();
-        delete context->startupStorage;
+        context->startupStorage->deleteLater();
 
         if (context->currentStorageType == ResumeDataStorageType::Legacy)
             Utils::Fs::removeFile(dbPath);