default value of 1 for simplesamlphp_auth_allowdefaultloginusers is too restrictive

The recent change that put "1" as the default value for simplesamlphp_auth_allowdefaultloginusers is resulting in a situation that is too restrictive by default. The problem arises when a privileged user, other than superuser (uid 1), is installing the module. The second the module is activated any user other than 1 is logged out.

The default of "1" for simplesamlphp_auth_allowdefaultloginusers needs to be removed and the simplesamlphp_auth_activate directive needs to be back ported to this version.