The idea is that both taskbar icons and recents navigate you to new apps, which we'd want to disable in similar contexts. Hence reusing FLAG_DISABLE_RECENTS.
Test: locally set FLAG_DISABLE_RECENTS=true, ensure taskbar icons don't show up (both in 3 button mode and gesture nav)
Bug: 193183428
Bug: 194990283
Change-Id: I9537f57dc25663151b1414c5260dadb58506fdb0