WebUI: Change of default value of type of new group back to POSIX

In FreeIPA 2.2, the default for group type was 'POSIX', in 3.0 it's 'normal' (non-posix). CLI's default is 'POSIX', Web UI should use 'POSIX' as well.

https://fedorahosted.org/freeipa/ticket/3270

install/ui/group.js

@@ -153,7 +153,7 @@ IPA.group.entity = function(spec) {
                     name: 'type',
                     label: IPA.messages.objects.group.type,
                     flags: ['no_command'],
-                    default_value: 'normal',
+                    default_value: 'posix',
                     options: [
                         {
                             value: 'normal',