Patron Stat Cat Enhancements: Fix values stored, then displayed in "Allow freetext...

Patron Stat Cat Enhancements: Fix values stored, then displayed in "Allow freetext" categories

In the patron registration screen:  the widget dijit.form.FilteringSelect
stores the option value, not the displayed value, unlike ComboBox; so store
the FilteringSelect displayedValue, then set the FilteringSelect displayedValue
with the value retrieved from the patron/stat_cat_entry map table.

Signed-off-by: Scott Prater <sprater@gmail.com>
Signed-off-by: Ben Shum <bshum@biblio.org>
Signed-off-by: Thomas Berezansky <tsbere@mvlc.org>