filediff: Handle save responses better in delete events (bgo#744081)
The "you have modified files" dialog offers a "Close without saving" option, which returns a CLOSE response code instead of our usual OK. This was being handled correctly in most places, but not when the tab was being closed via a delete event. This patch fixes it so that the check_save_modified() always returns either OK or CANCEL, since that's really the only thing we need out of it. This commit also removes a stray delete-event handler on a widget that should never ever be loaded.
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