be able to destroy applets even when locked: delete their config
by hand.
Except in one case: when the applet gets automatically destroyed
by dbus activation do *not* clear the config, it should be
reused next time.
When there is already a config for a given plasmoid, reuse it
instead of creating a brand new plasmoid (having config groups
endlessy accumulating in the config file)
BUG:365618
BUG:365569