[openstreetmap-website] Fix off-by-one error in user notes list (#790)

[SomeoneElseOSM]

Has something gone a bit wrong in here?  "Next" doesn't seem to work at all now:

https://help.openstreetmap.org/questions/35206/osm-notes-next-page-buttons-not-working

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/790#issuecomment-50228278
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