fix: use the correct order in merging map attributes

lib/UESUpdateHelper.php

@@ -168,7 +168,7 @@ class UESUpdateHelper
                     strpos($attribute[self::TYPE], self::MAP_TYPE) ||
                     !in_array($attrName, $serializedAttributes, true)
                 ) {
-                    $attr = array_merge($attr, $attribute[self::VALUE]);
+                    $attr = array_merge($attribute[self::VALUE], $attr);
                 } else {
                     $attr = array_merge($attr, explode(';', $attribute[self::VALUE]));
                 }