Make sure that old URLs do not appear duplicated in places model
Summary:
BUG: 389401
KIO model now provides Baloo URLs; we need to remove the old ones
created by Dolphin places model
BUG: 387888
Depends on D9332
Test Plan: unit test
Reviewers: mwolff, Dolphin, ngraham, elvisangelaccio
Reviewed By: Dolphin, ngraham, elvisangelaccio
Subscribers: elvisangelaccio, broulik, ervin, ngraham, Dolphin
Differential Revision: https://phabricator.kde.org/D9333