Port KRun::run usage to run another Dolphin process, to ApplicationLauncherJob
Test Plan: Opening a new window works
Reviewers: elvisangelaccio, ngraham, meven
Reviewed By: elvisangelaccio, meven
Subscribers: meven, kfm-devel
Tags: Dolphin
Differential Revision: https://phabricator.kde.org/D28807