Fix Profile save behavior

Summary:
Profiles were not being saved correctly before when askToSave was run it would save to the new index not the
old

Test Plan:
make several profiles with some data, change data in one , select new profile , save when asked and check the
correct profile was written to

Reviewers: patrickelectric, tcanabrava, laysrodrigues

Reviewed By: patrickelectric, laysrodrigues

Tags: Atelier

Differential Revision: https://phabricator.kde.org/D18917