EZP-22813: Impossible to create users in IE11

JIRA: https://jira.ez.no/browse/EZP-22813

# Description

In IE11 (with the default settings) has a very weird behavior: if you start filling a form (with ezautosave enabled) and you give the focus to a password field the form will not be submitted to the iframe (referenced in the `target` 
form attribute to allow upload while having an *ajax-like* request).

This does not happen if the *Enable Protected Mode* setting is disabled for the security zone used by IE but by default any web site is in a zone where this *protected mode* is on...

As a result, this patch is more a workaround than an actual fix since it adds a setting to disable autosave in forms having a password field for some IE versions but unfortunately there's no way to fix that properly... 

# Tests

manual tests