don't connect to lambdas and call slots when you can just call the slots
the lambdas were really unnecessary. both deleteLater and restart
are losts, and arg-less ones at that, so instead of using a lambda we can
just connect to the slots directly.
Reviewers: Plasma, davidedmundson
Reviewed By: Plasma, davidedmundson
Differential Revision: https://phabricator.kde.org/D19937