fingerprint(list)view: Queue calls to stopEditing()

This is a work-around for a bug in the back-end that produces edit conflicts when saving multiple
fingerprint elements immediately after another. Since queueing the stopEditing() calls involves
queueing API request, this work-around should be removed as soon as the back-end is fixed.

Bug: 72020
Change-Id: Ifdc37e764621ea300b440b34d9cb3b43bb2fb6b6
Merge "fingerprint(list)view: Queue calls to stopEditing()"