Fix crash in LauncherTasksModel::Private::requestRemoveLauncherFromActivities
Change the 'launcher' variable from a reference to an implicit shared copy to avoid a use-after-free error
Add a regression test to launchertasksmodeltest.cpp
Change the 'launcher' variable from a reference to an implicit shared copy to avoid a use-after-free error
Add a regression test to launchertasksmodeltest.cpp