Don't use hardcoded path for temp folder

src/gui/torrentcontentmodel.cpp

@@ -151,10 +151,10 @@ namespace
      */
     bool doesQFileIconProviderWork()
     {
-        const QString PSEUDO_UNIQUE_FILE_NAME = u"/tmp/qBittorrent-test-QFileIconProvider-845eb448-7ad5-4cdb-b764-b3f322a266a9"_qs;
+        const Path PSEUDO_UNIQUE_FILE_NAME = Utils::Fs::tempPath() / Path(u"qBittorrent-test-QFileIconProvider-845eb448-7ad5-4cdb-b764-b3f322a266a9"_qs);
         QFileIconProvider provider;
-        const QIcon testIcon1 = provider.icon(QFileInfo(PSEUDO_UNIQUE_FILE_NAME + u".pdf"));
-        const QIcon testIcon2 = provider.icon(QFileInfo(PSEUDO_UNIQUE_FILE_NAME + u".png"));
+        const QIcon testIcon1 = provider.icon(QFileInfo((PSEUDO_UNIQUE_FILE_NAME + u".pdf").data()));
+        const QIcon testIcon2 = provider.icon(QFileInfo((PSEUDO_UNIQUE_FILE_NAME + u".png").data()));
         return (!testIcon1.isNull() || !testIcon2.isNull());
     }