This commit swaps the parameter order in is_direct_member_of
function to have user_id followed by user_group_id since user_id
is a member of user_group_id and not the other way around.
We do not have any system user groups as of
now, but this commit is just a prep commit
to prevent any change in user-facing pages
to avoid confusion till this feature is
completed.
This change was initially made in 6117c38,
but it was reverted in 1543775a due to merge
conflicts with the typescript migration of
user_groups.js.
Sahil Batra
Anders Kaseorg
Tim Abbott
Priyank Patel