Modernise code in FolderMan::backwardMigrationSettingsKeys

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

src/gui/folderman.cpp

@@ -377,11 +377,11 @@ void FolderMan::backwardMigrationSettingsKeys(QStringList *deleteKeys, QStringLi
 
     auto processSubgroup = [&](const QString &name) {
         settings->beginGroup(name);
-        const int foldersVersion = settings->value(QLatin1String(settingsVersionC), 1).toInt();
+        const auto foldersVersion = settings->value(QLatin1String(settingsVersionC), 1).toInt();
         if (foldersVersion <= maxFoldersVersion) {
-            foreach (const auto &folderAlias, settings->childGroups()) {
+            for (const auto &folderAlias : settings->childGroups()) {
                 settings->beginGroup(folderAlias);
-                const int folderVersion = settings->value(QLatin1String(settingsVersionC), 1).toInt();
+                const auto folderVersion = settings->value(QLatin1String(settingsVersionC), 1).toInt();
                 if (folderVersion > FolderDefinition::maxSettingsVersion()) {
                     ignoreKeys->append(settings->group());
                 }