Port away from deprecated QDateTime::.toTime_t method

src/panels/places/placesitem.cpp

@@ -264,7 +264,7 @@ QString PlacesItem::generateNewId()
     // " (V2)" to indicate that the ID has been generated by
     // a new version of the places view.
     static int count = 0;
-    return QString::number(QDateTime::currentDateTimeUtc().toTime_t()) +
+    return QString::number(QDateTime::currentDateTimeUtc().toSecsSinceEpoch()) +
             '/' + QString::number(count++) + " (V2)";
 }