Applets are destroyed every time we close plasma as well as user
actions.
We only want to remove the shortcut from the registry from when an
applet is actually removed.
The end-user impact was limited as when we restart plasma we re-register
and plasma keeps it's own cache of what the shortcut should be so it
doesn't matter that kglobalaccel lost it's version.
The problem is that it means we send bogus calls to kglobalaccel after
kglobalaccel is potentially closed.
Testing done:
- set a shortcut on an applet
- confirmed it still worked after plasma restart
- removed an applet (and closed notificaiton so it wasn't in the
transient state)
- confirmed the entry was gone from system settings and the global
shortcut no-opped.
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