Fix dedupe regression whereby deleted contacts are found

Fix dedupe regression whereby deleted contacts are found

This affects api calls where check_permissions = TRUE and getduplicates is called. This can be
done via the api (per this test) or ann easy UI way is with the deduper extension but it should
also affect the 'normal' dedupe screen.

Note that there can be cases where the dedupe results are cached into prevnext cache to hide this