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. Bug: 194359067
This was fixed in master, but not S.
Test: atest FrameworksServicesTests:TouchExplorerTest

Change-Id: I388edfc5689584b8def7ef421a0bd9be89b71d5b
(cherry picked from commit 2ce8b0c8)