TouchExplorerTest: fix run error.

This line should've been removed long ago because we don't even use the object it declares, but it only recently started to throw an exception. I'm surprised this never tripped up presubmit since we haven't touched this test since november.
Bug: 159651900
Test: atest FrameworksServicesTests:TouchExplorerTest

Change-Id: I388edfc5689584b8def7ef421a0bd9be89b71d5b