Fix remotedirnotify service file

Summary:
kded plugin is actually named "remotenotifier", update .desktop file accordingly
This should fix kded kcm not picking up the service status

Reviewers: Frameworks, elvisangelaccio

Reviewed By: elvisangelaccio

Subscribers: elvisangelaccio

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D11628