Fixes CombinationKeyTests#testPowerVolumeUp failure

Test fix for WmTests_server_policy_Presubmit CombinationKeyTests
failure.

Test result before the change (failing): https://android-build.corp.google.com/test_investigate/invocation/I55600010376225931/test/TR42329663466409900/
Test result with the change (passing): https://android-build.corp.google.com/test_investigate/invocation/I05800010376241103/test/TR39029663462625150/?status=none

Bug: 402397057
Test: atest WmTests_server_policy_Presubmit
Flag: TEST_ONLY
Change-Id: I1620e96805e0473a1d52e7ff6c7662057bd0f512