contactmodel: fix temporary contact when user try to search ring:uri

If a user search ring:uri, the temporary contact should use the uri
without ring: like everywhere else in the LRC.

Note: clean contactmodeltester

Change-Id: I1a5593446038bd46ba011d8e5cf6addc2891331a
Reviewed-by: Anthony Léonard <anthony.leonard@savoirfairelinux.com>