Revert "Merge pull request #12621 from gtorodelvalle/contacts-bug-922083...

...-unit-tests-for-duplicate-contact-details-reloaded"

This reverts commit a14021046db0bc944c32dc5de9087b23e62d7bb5, reversing
changes made to db5776aad213f9ddba82810ff7f1b366f9492454.