[fix] Reverse one checkstyle fix

Author: hazendaz

src/main/java/org/apache/ibatis/scripting/xmltags/ForEachSqlNode.java

@@ -59,6 +59,7 @@ public boolean apply(DynamicContext context) {
     applyOpen(context);
     int i = 0;
     for (Object o : iterable) {
+      DynamicContext oldContext = context;
       if (first || separator == null) {
         context = new PrefixedContext(context, "");
       } else {
@@ -79,7 +80,6 @@ public boolean apply(DynamicContext context) {
       if (first) {
         first = !((PrefixedContext) context).isPrefixApplied();
       }
-      DynamicContext oldContext = context;
       context = oldContext;
       i++;
     }