Launchers set new bool in plasma-frameworks to toggle expanded

The launcher applets couldn't be closed with Meta alone and on Wayland
in general by any global shortcut, since we used for that the focusOutEvent
triggered only on X and only on global shortcuts (on default Alt+F1).

This patch let the launchers use the new bool activationTogglesExpanded in
order to solve this issue.

Differential Revision: https://phabricator.kde.org/D3079