Fix WikiPageEntityLookupTest.

This test was broken by Iad65b4b19b3, apparently by an accidental
removal of lines. The fact that it didn't fail immediately was
pure chance: the revision numbers matched because this was the first
test being executed that stored things to the database.

Change-Id: I8d5a398d8b32bd578cba2b9341bdf1dcee64b375
Merge "Fix WikiPageEntityLookupTest."