Fix a duplicate case statement

Summary: This appears to be a typo, identified by `ArcanistXHPASTLinter::LINT_DUPLICATE_SWITCH_CASE` (see D11171).

Test Plan: `arc lint`

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11194

Author: joshuaspence

src/applications/auth/editor/PhabricatorAuthProviderConfigEditor.php

@@ -41,7 +41,7 @@ protected function getCustomTransactionOldValue(
         return (int)$object->getShouldAllowLink();
       case PhabricatorAuthProviderConfigTransaction::TYPE_UNLINK:
         return (int)$object->getShouldAllowUnlink();
-      case PhabricatorAuthProviderConfigTransaction::TYPE_UNLINK:
+      case PhabricatorAuthProviderConfigTransaction::TYPE_TRUST_EMAILS:
         return (int)$object->getShouldTrustEmails();
       case PhabricatorAuthProviderConfigTransaction::TYPE_PROPERTY:
         $key = $xaction->getMetadataValue(