Fix CLEAR_USER_JOURNEY_SESSION_MSG

The CLEAR_USER_JOURNEY_SESSION_MSG message is using msg.arg1, but that isn't ever being sent because the wrong obtainMessage was used to create the message: the current obtainMessage sets msg.obj; to set msg.arg1, the two-int obtainMessage must be used instead.

Change-Id: I47223b883d030ffa5cf01153e61b896c8a83dae5
Test: manual
Bug: 146505521