Re-fetch hold for cancel notify to correct timestamp

Re-fetch hold for cancel notify to correct timestamp

Re-fetch the cancelled hold from the DB before passing it off to
action/trigger for notification processing.  Otherwise, A/T attempts to
perform date math on "now" instead of a valid timestamp and subsequently
croaks.

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>