Fix edit patrolling in multi Diffs

In multi diffs we had a "wrong" value for rc_last_oldid
set (not the directly previous revision but the one
selected by the user). Due to that there weren't any
unpatrolled recentchanges rows found. As that is cached
in memcached these rows stay unpatrollable forever.

Bug: 49019
Change-Id: I5d6111032dba7d102e30d85718639697f44c036e
Merge "Fix edit patrolling in multi Diffs"