Replace new Boolean() with Boolean.valueOf()

Signed-off-by: Tobi Schäfer <interface@p3k.org>

src/main/java/helma/objectmodel/TransientProperty.java

@@ -76,7 +76,7 @@ public final class TransientProperty implements IProperty, Serializable {
                 return svalue;
 
             case BOOLEAN:
-                return new Boolean(bvalue);
+                return Boolean.valueOf(bvalue);
 
             case INTEGER:
                 return Long.valueOf(lvalue);