Added brackets to make toString omre readable when multiple extensions printed out.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@272602 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/extension/ExtensionAdapter.java

@@ -276,6 +276,6 @@ public class ExtensionAdapter
 
     public String toString()
     {
-        return toExtension().toString();
+        return "{" + toExtension().toString() + "}";
     }
 }