Fix clazy warning

calendarjanitor/collectionloader.cpp

@@ -45,7 +45,7 @@ void CollectionLoader::onCollectionsLoaded(KJob *job)
         for (const Akonadi::Collection &collection : collections) {
             const QStringList contentMimeTypesLst = collection.contentMimeTypes();
             QSet<QString> collectionMimeTypeSet = QSet<QString>(contentMimeTypesLst.begin(), contentMimeTypesLst.end());
-            if (!mimeTypeSet.intersect(collectionMimeTypeSet).isEmpty()) {
+            if (mimeTypeSet.intersects(collectionMimeTypeSet)) {
                 m_collections << collection;
             }
         }

konsolekalendar/konsolekalendar.cpp

@@ -89,7 +89,7 @@ bool KonsoleKalendar::printCalendarList()
             const QStringList contentMimeTypes = collection.contentMimeTypes();
             auto collectionMimeTypeSet = QSet<QString>(contentMimeTypes.begin(), contentMimeTypes.end());
 
-            if (!mimeTypeSet.intersect(collectionMimeTypeSet).isEmpty()) {
+            if (mimeTypeSet.intersects(collectionMimeTypeSet)) {
                 QString colId = QString::number(collection.id()).leftJustified(6, QLatin1Char(' '));
                 colId += QLatin1String("- ");