SaleQuoteItemEditor: hide taxes if no NFE plugin.

If the NFE plugin is active, the SaleQuoteItemEditor should not allow
ICMS and IPI tax information to be edited.

Change-Id: Id7ddf4bf52a4f5d1a5c6983b77a87dc83dceb9ce
Fixes: http://bugs.async.com.br/show_bug.cgi?id=5556