Feedback form: Use autocomplete on input elements

[alundgard]

Add the autocomplete attribute to the form <input> and <textarea> elements (see SODA's recommendation below).

Reported by SODA

Description
Autocomplete is not used. Use autocomplete on standard input elements to help users easily fill out forms with the least amount of probability of error.

Recommended to Fix
Use autocomplete to help users fill out forms.

<input type="text" name="contact_form[name]" autocomplete="name">

<input type="email" name="contact_form[email_address]" autocomplete="email">

<textarea rows="4" required="required" name="contact_form[message]" autocomplete="off"></textarea>

https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/autocomplete