Fix summary display in TPAC; avoid Content Cafe

Fix summary display in TPAC; avoid Content Cafe

While in misc_util.tt2 we're grabbing args.summary as a single string,
and args.summaries as the list of summaries, this gets complicated
elsewhere in the summaries display chain, where we're checking for the
number of list elements in "summary" (which is now a string), as well as
a confusion of logic where ContentCafe was being displayed whether or
not the environment variable existed.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Ben Shum <bshum@biblio.org>