Fixed missing default shell field.

The config default page has been fixed to provide a field for the
ipadefaultloginshell attribute.

Ticket #1895

install/ui/serverconfig.js

@@ -55,6 +55,7 @@ IPA.entity_factories.config = function(){
                             other_field: 'cn'
                         },
                         'ipahomesrootdir',
+                        'ipadefaultloginshell',
                         'ipamaxusernamelength',
                         'ipapwdexpadvnotify',
                         {