Exclude WMShellFlickerServiceTests from WMShellFlickerTestsOther

ag/23773685 added a new config to run the new tests added in ag/23773684
but forgot to exclude those tests from the catch all
WMShellFlickerTestsOther module. The tests should only be running
under the WMShellFlickerServiceTests module.

Test: atest WMShellFlickerTestsOther
Fixes: 290035043
Change-Id: I245314a586854630aada79dd9fd021d576eb9577