Fix signal not connecting due to API change

The API of registeredNameFound was changed in the LRC resulting
in a signal not beeing connected in the account wizard.
The slot receiving the signal is updating the registered name search
status.

Change-Id: Ide79a4d070aa6f0ab34054208c39a42527831ed9
Reviewed-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>