Contacts metrics: flip contacts merge order since they have dependency

CONTACTS_AUTO_MERGE needs to insert before CONTACTS_MANUAL_MERGE
since it checks for the existence of a CONTACTS_MANUAL_MERGE with the
same rawId entries (a manual contact merge would trigger the same code
path in Contacts Content Provider as an auto merge, so this check is needed)

Issue-Id: CD-501

Change-Id: I5716cdf142c38a2967f38c7b541bbbfeeebe178b