Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  20c6afe7f51d14e978f348f376d58e28a9d2b3df

Properly reset inPre state in the pre handler

Also added a parser test that currently fails in html2wt and html2html 
mode as we are collapsing two adjacent pre elements into one (bug 57276).

Change-Id: I7c63a44ce24dfcaea3f1f573eee1ce38a3410d46