provisioning/list_contacts: make augmentation with avatar more efficient

Signed-off-by: Sumner Evans <sumner@beeper.com>

provisioning.go

@@ -294,7 +294,7 @@ func (prov *ProvisioningAPI) ListContacts(w http.ResponseWriter, r *http.Request
 		augmentedContacts := map[types.JID]interface{}{}
 		for jid, contact := range contacts {
 			var avatarUrl id.ContentURI
-			if puppet := prov.bridge.DB.Puppet.Get(jid); puppet != nil {
+			if puppet := prov.bridge.GetPuppetByJID(jid); puppet != nil {
 				avatarUrl = puppet.AvatarURL
 			}
 			augmentedContacts[jid] = map[string]interface{}{