Fixing latency tests.

Now they fetch Overview correctly for Quickstep.

The test will start succeeding, but won't produce results because we
need another CL in Launcher to generate events for the analysis.

Bug: 72967764
Test: atest google/perf/app-transition/sysui-latency-test
Change-Id: Ie114452953baa5e29dafc7121a32211e54fb437c