Add show=unpatrolled to the recentchanges API

Adding it only in the API because SpecialRecentChanges only shows
"Hide patrolled edits" option if rcpatrol is enabled.

show=!patrolled returns results that include changes that can't
be patrolled which technically correct (they aren't correct)
but probably not what you're looking for when looking for
unpatrolled changes.

Change-Id: I356a8625c7126b90aa7e7a23efe3bef7d448b502
Merge "Add show=unpatrolled to the recentchanges API"