ACQ: Avoid refetching LIDs after update if page changes

ACQ: Avoid refetching LIDs after update if page changes

After updating a pile of LID (copy) objects in the ACQ lineitem table,
if the user clicks the Return button to return to the main LI table,
avoid re-fetching and re-drawing the copy grid, which is no longer
visible.  This solves the problem of returning to the LI table, opening
the copy display for a new LI, only to find the copies from the
previous LI drawn into the grid.

Signed-off-by: Bill Erickson <berick@esilibrary.com>