VST Effects: fix for uncontrollable plugin window

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Supposed fix for 3595560, see also
http://sourceforge.net/apps/phpbb/lmms/viewtopic.php?f=7&t=778
http://sourceforge.net/tracker/?func=detail&aid=3595560&group_id=105168&atid=640434

VST effects pluginWidget is not deleted, when we close General Settings of instrument track,
on which are directly attached VST effects, but only when we remove this VST effects or tracks itself.

Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>

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