update changed repo location immediately after acceptance
update changed repo location immediately after acceptance

fixes #1524

before, if a longer backup got interrupted before commit(),
it asked same question again.

edgewood/borg,edgimar/borg,edgimar/borg,raxenak/borg,edgewood/borg,raxenak/borg,RonnyPfannschmidt/borg,edgimar/borg,edgewood/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,raxenak/borg,edgewood/borg,edgimar/borg,raxenak/borg