Update config hash after adopting startup session
Update config hash after adopting startup session

Some config fields (e.g. target_buffer) change when a startup tracing
session is adopted. So we need to update its hash too.

Change-Id: Iae58f114efe8d4cac3d5e84650e23ab9d8ed144b

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto