Fix overzealous template application

Fix overzealous template application

The idea was that we'd track templates if they were applied prior to copies
actually being specified in the unified interface, and then apply them "for
real" once copies were entered.  But these remembered templates kept applying
themselves whenever changes were made in the volume/copy creator portion of
the interface (possibly overriding tweaks made by staff).  So now we delete
the list of tracked templates once they're applied to actual copies.

Signed-off-by: Jason Etheridge <jason@esilibrary.com>