Add Traceur to user builds.

This adds the Traceur app to all builds on phones and tablets.
Previously, it was included on userdebug builds on specific devices only.

Bug: 64762598
Test: Flashed a user build and a userdebug build and saw Traceur on both
builds.

Change-Id: I9bf7d68c737845a519f57f8f60ee9064bf33a2f5