D21789: Fix tests relating to the removal of the Root Place in D15739

[Méven Car]

meven added a dependency: D15739: [Places panel] Don't show Root by default.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D21789

To: meven, elvisangelaccio, ngraham
Cc: kfm-devel, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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