UserTile: Fix displaying user information for multi-user devices

In commit 89ab0eb097322ac8eec40159b888dfb03b9413e9, we improved
the handling of single user devices but appear to have also
entirely deleted the name / avatar for multi-user devices.

This commit restores the deleted code for multi-user devices.

This fixes CYAN-4023.

Change-Id: I69fe1504da2b32cd5bf0fdc87f8f78c960e9c77f
MediaFile: support more media types

Change-Id: Ib3109c5ebc762b97e45bd0bb5fa82ad77b0e6822