when formatting params for deduping, we do a case sensitive check for Primary

I've run into a problem - when I call the Profile.getfields with api_action=submit and a profile_id, I get a nice list of fields in that profile, notably - the primary email field name is lowercased to email-primary.

When I fill out those fields and submit them to CRM_Contact_BAO_Contact::getDuplicateContacts I fail to find the duplicates that should be found.

It turns out that's because getDuplicateContacts calls Dedupe_Finder::formatParams which does some nice magic on primary style fields by finding them with:

preg_match('/(.*)-(primary-[\d+])$|(.*)-(\d+|Primary)$/', strtolower($key), $matches)

The capital P is what causes the problem.

I think it's safe to convert that to a lowercase check.