[PATCH] recook current article if changing news_headers_(not_)to_display

[Urs Janßen]

recooking of article was not done when changing
news_headers_to_display and/or news_headers_not_to_display
in the 'M'enu. The attached patch should fix that if done from
the attributes menu (sub menu reachable via TAB from the normal one).

urs