Fixing testOverview test

Apparently, we can't generally expect that flinging to and
fro will return Overview to the original task, especially
if the device performance is low.

Now starting the expected task explicitly.

Test: presubmit
Bug: 182794819
Change-Id: Ia2931f4f3005c46dd72990c247a90f9010b9b8d5
1 file changed