Fix misuse of array values in deduplicateWatchlistEntries()

The title tuple is in the array key, not the boolean value.
Passing the boolean to explode() triggered warnings and broke
merges of users that shared pages on their watchlists.

Bug: T162563
Change-Id: Ida2f8f042d4702983db7d029127d015bd177ff3d
(cherry picked from commit db4db632a2de638d2ce072f6f7b691fba5bb425f)
1 file changed