Explictly register DBus metatypes for shortcuts

David Edmundsonrequested to merge
work/d_ed/lock_explode into master

Typically this is done in the KGlobalAccel contstructor, but if ksmserver does not have any shortcuts registered we would fail here.

Testing: in kdeglobals

[KDE Action Restrictions][$i]
action/lock_screen[$i]=false
action/start_new_session[$i]=false
action/switch_user[$i]=false

after a reboot loginctl lock-session

We still lock, going through this manual shortcut path, but without any other shortcut code run.

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