[PATCH] Fix deref() in KMainWindow not being called

[Thomas McGuire]

Hi,

currently KMail does not quit when the composer was open. This is because 
closing the composer doesn't call deref(), even though KMainWindow is supposed 
to do that for us.
The reason for that is that the composer overrides closeEvent(), which in 
KMainWindow is doing the deref() call.

Since the ref() call happens in the constructor, I changed the deref() call to 
happen in the destructor, to ensure it is always called.
Right now, overriding closeEvent() is a trap for application developers, this 
behavior is quite surprising.

I hope this patch doesn't have any side effects.

Any objections to committing this?

Regards,
Thomas
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