Do not allow edit client and category in services related to sales.

If need to change that data, edit directly the sale.
- Now, when change the client in sale, it will also save on service.

Change-Id: I8bfcdad619bb9a8162b9d2fdb47f9970735b4ac6
Fixes: http://bugs.async.com.br/show_bug.cgi?id=5653