Remove autocomplete default option

So that it passes HTML5 validation.
"Attribute autocomplete not allowed on element input at this point" - w3c html5 validator
"The autocomplete attribute is allowed only on input elements with the type text, search, url, tel, e-mail, password, datetime, date, month, week, time, datetime-local, number, range, or color." - http://help.simplytestable.com/errors/html-validation/attribute-x-not-allowed-on-element-y-at-this-point/attribute-autocomplete-not-allowed-on-element-input-at-this-point/