use the type String and do not clone explicitely (Strings are final and unmodifable)

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@806530 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/analysis/tokenattributes/TypeAttributeImpl.java

@@ -69,6 +69,6 @@ public class TypeAttributeImpl extends AttributeImpl implements TypeAttribute, C
   
   public void copyTo(AttributeImpl target) {
     TypeAttribute t = (TypeAttribute) target;
-    t.setType(new String(type));
+    t.setType(type);
   }
 }