ap/collection: don't advertise next page if no more entries

And off-by-one error caused the last page
to always advertise one more page eventhough
the absence of further items is known

lib/pleroma/web/activity_pub/views/user_view.ex

@@ -290,7 +290,7 @@ def collection(collection, iri, page, show_items \\ true, total \\ nil) do
       "orderedItems" => if(show_items, do: items, else: [])
     }
 
-    if offset < total do
+    if offset + 10 < total do
       Map.put(map, "next", "#{iri}?page=#{page + 1}")
     else
       map