Templates: fix invalid HTML markup on step 2 of the "Create Group" form.

Unordered lists were made children of respective label elements; this change moves the lists to after the label element.

Fixes #5816, props mercime

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8927 cdf35c40-ae34-48e0-9cc9-0c9da1808c22