Bug 7128 - adding some ID's to make styling opac-main.tt a bit easier

Bug 7128 - adding some ID's to make styling opac-main.tt a bit easier

To test:
verify that the loggedin id is added when user is logged in
verify that the notloggedin id is evident when no user is logged in.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Bug 7128 : Follow up, adding the id to the case when a user is not logged in

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
(cherry picked from commit 4ccb8649f88abaf9012f1bbec06fc840046cb7ff)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>