Update protection handling for core change I6bf650a3

Gerrit change I6bf650a3 to mediawiki/core changed the rights used for
the default page protection levels, and changed the behavior of the
'editprotected' right. This changes FlaggedRevs to match.

Change-Id: Iac866bc19fdd47476559b940ea27b73ad4248616
Merge "Update protection handling for core change I6bf650a3"