Fix building with older libstdc++

We still can't use std::ranges::to() :((

client/models/userlistmodel.cpp

@@ -162,10 +162,11 @@ void UserListModel::filter(const QString& filterString)
     QElapsedTimer et; et.start();
 
     beginResetModel();
-    auto filteredMembers =
+    // TODO: use std::ranges::to() once it's available from all stdlibs Quotient builds with
+    auto filteredMembersView =
         std::views::filter(m_currentRoom->joinedMembers(),
-                           Quotient::memberMatcher(filterString, Qt::CaseInsensitive))
-        | std::ranges::to<QList>();
+                           Quotient::memberMatcher(filterString, Qt::CaseInsensitive));
+    QList filteredMembers(filteredMembersView.begin(), filteredMembersView.end());
     std::ranges::sort(filteredMembers, Quotient::MemberSorter());
     const auto sortedIds = std::views::transform(filteredMembers, &RoomMember::id);
 #if QT_VERSION >= QT_VERSION_CHECK(6, 6, 0)