before head/in head/after head treatment of /p should match /br

Currently "br" close tag is special cased in the "before head", "in
head", "in head noscript", and "after head" insertion modes. To match
existing behaviour, a "p" close tag should have the same affect as a
"br" close tag.

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Geoffrey Sneddon — Opera Software
<http://gsnedders.com/>
<http://www.opera.com/>