webstaff: Item Status bugs with Transfer Items...

webstaff: Item Status bugs with Transfer Items...

...to Previously Marked Volume

Now it throws up the override dialog only if an ils event is returned,
and it doesn't prematurely refresh the screen or re-scan a barcode
while the dialog is open.

Signed-off-by: Jason Etheridge <jason@equinoxinitiative.org>
Signed-off-by: Andrea Neiman <abneiman@equinoxinitiative.org>
Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>