Put temporary files in qbt own temp folder

src/base/bittorrent/session.cpp

@@ -2300,7 +2300,7 @@ bool Session::loadMetadata(const MagnetUri &magnetUri)
     p.max_connections = maxConnectionsPerTorrent();
     p.max_uploads = maxUploadsPerTorrent();
 
-    QString savePath = QString("%1/%2").arg(QDir::tempPath(), hash);
+    QString savePath = QString("%1/%2").arg(Utils::Fs::tempPath(), hash);
     p.save_path = Utils::Fs::toNativePath(savePath).toStdString();
 
     // Forced start

src/gui/guiiconprovider.cpp

@@ -37,6 +37,7 @@
 #endif
 
 #include "base/preferences.h"
+#include "base/utils/fs.h"
 
 GuiIconProvider::GuiIconProvider(QObject *parent)
     : IconProvider(parent)
@@ -124,7 +125,7 @@ QString GuiIconProvider::getIconPath(const QString &iconId) const
 {
 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
     if (m_useSystemTheme) {
-        QString path = QDir::temp().absoluteFilePath(iconId + ".png");
+        QString path = Utils::Fs::tempPath() + iconId + ".png";
         if (!QFile::exists(path)) {
             const QIcon icon = QIcon::fromTheme(iconId);
             if (!icon.isNull())