Update TreeMapWithStages.scala

Author: nicolasstucki

compiler/src/dotty/tools/dotc/transform/TreeMapWithStages.scala

@@ -152,7 +152,7 @@ abstract class TreeMapWithStages(@constructorOnly ictx: Context) extends TreeMap
         case _: Template =>
           for sym <- tree.symbol.owner.info.decls do
             markSymbol(sym)
-          super.transform(tree)
+          mapOverTree(tree)
 
         case _ =>
           markDef(tree)