Fix startup performance on Qt5

Use more appropriate container (QList) for resume data queue buffer.
QVector in Qt5 has poor performance of the first element taking operation,
which is used to process the resume data queue. In Qt6, QVector is just an
alias for QList, so there was no problem there.

PR #18387.
Fixes #18341.

src/base/bittorrent/sessionimpl.cpp

@@ -340,7 +340,7 @@ struct BitTorrent::SessionImpl::ResumeSessionContext final : public QObject
 
     ResumeDataStorage *startupStorage = nullptr;
     ResumeDataStorageType currentStorageType = ResumeDataStorageType::Legacy;
-    QVector<LoadedResumeData> loadedResumeData;
+    QList<LoadedResumeData> loadedResumeData;
     int processingResumeDataCount = 0;
     int64_t totalResumeDataCount = 0;
     int64_t finishedResumeDataCount = 0;