[openstreetmap/openstreetmap-website] Update num_changes when backfilling changesets (PR #6361)

[Anton Khorev]

AntonKhorev left a comment (openstreetmap/openstreetmap-website#6361)

> I don't remember if Rails checks the current number of changes while holding a lock on Changesets. If not, then there's a chance of a race condition.

There's no changeset lock for single element writes.

> On cgimap, there's an exclusive lock on the changeset id in place, which prevents this sort of issue.

cgimap doesn't have single element writes.

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