revert: regional country codes UI (#2567) (#2621)

client/core/utils/api/apiUtils.cpp

@@ -2,7 +2,6 @@
 
 #include "core/utils/serverConfigUtils.h"
 #include "core/utils/constants/configKeys.h"
-#include <QLatin1Char>
 #include <QDateTime>
 #include <QJsonDocument>
 #include <QJsonObject>
@@ -229,18 +228,3 @@ QString apiUtils::getPremiumV2VpnKey(const QJsonObject &serverConfigObject)
 
     return vpnKeyText;
 }
-
-QString apiUtils::countryCodeBaseForFlag(const QString &fullCountryCode)
-{
-    const QString trimmed = fullCountryCode.trimmed();
-    if (trimmed.isEmpty()) {
-        return QString();
-    }
-    const int dashIdx = trimmed.indexOf(QLatin1Char('-'));
-    const QString base = dashIdx < 0 ? trimmed : trimmed.left(dashIdx);
-    const QString normalized = base.trimmed();
-    if (normalized.isEmpty()) {
-        return QString();
-    }
-    return normalized.toUpper();
-}