[konheko] Fix compilation for aarch64

src/models/roommodel.cpp

@@ -851,9 +851,9 @@ QVariant Room::data(const QModelIndex &index, int role) const {
         return QString::fromStdString(
             std::visit([](const auto &e) -> std::string { return eventThumbnailUrl(e); }, event));
     case Height:
-        return std::visit([](const auto &e) -> uint64_t { return eventHeight(e); }, event);
+        return QVariant(qulonglong{std::visit([](const auto &e) -> uint64_t { return eventHeight(e); }, event)});
     case Width:
-        return std::visit([](const auto &e) -> uint64_t { return eventWidth(e); }, event);
+        return QVariant(qulonglong{std::visit([](const auto &e) -> uint64_t { return eventWidth(e); }, event)});
     case FileSize: {
         auto bytes = std::visit([](const auto &e) -> uint64_t { return eventFileSize(e); }, event);