Fix test flake in sysui test suite.

This code creates a timer 1 second in the future, which causes code to
run that has alredy been deconstructed, leading to an instrumentation
crash.

Fixes: 290111230
Test: atp v2/android-virtual-infra/test_mapping/presubmit-large-avd
Change-Id: Ibd786995cc6b8252aa5ce07d2aea5977ae2551db