Disable Test to make presubmits pass.

This test needs to be adjusted to the modified default value, which will
happen in a followup.

Test: atest com.android.server.wm.ActivityStarterTests#testBackgroundActivityStartsDisallowed_realCallingUidHasVisibleWindowAborted
Bug: 266015587
Change-Id: I4467d27d72c2fbe360b59ad9354bab4428b9327c