miqAjaxAuth - remove unused button argument
miqAjaxAuth - remove unused button argument

miqAjaxAuth is only ever called with (),
the other cases seem to send login_div as GET parameters which doesn't seem right anyway
(transferred from ManageIQ/manageiq@01ca9332e032587c5b60b2bdc0c82bca70567859)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic