[RESTRICT AUTOMERGE] Make LockTaskController default behaviour match ScreenPinningSettings. Fixes: 127605586 Test: atest LockTaskControllerTest Change-Id: I7d4c53fd6740f500d1a0ce18b47b83ed895300a5 (cherry picked from commit 5d6c1e8f451a920695e92fd321bbffe9c75f9aaa)