Tweaks to 'my lists' paging code

Tweaks to 'my lists' paging code

1) Don't set and refetch the 'my lists' settings if nothing changed.
(minor nit)

2) Get the count through the same code where we get the bookbag data.

For #2, I am concerned with the current duplication of logic. At best
we are doing things twice, and at worst we end up counting a set which
is slightly different than our actual bookbag search results.

In the updated code, I think the count accuracy is subject to
search/superpage limit settings, so lists are effectively limited by
the search settings. If that is a valid concern, we can beef up the
settings for this query.

Signed-off-by: Dan Wells <dbw2@calvin.edu>