Test grouping was broken in recent commits. Fixed that. With improved
session reset, there's even less reasons to not group tests.
Still disabling combined test runs for now. We'll bring that back after
we robustly reset the application between test runs including the state
of "search boxes" and state of the Properties panel groups, etc.

Change-Id: I4916d1cecd051e2cc67ce38beda87a3fae90dd52