[Memory Leak] Fix leak of TIS and Launcher activity via DisplayModel

ag/33878089 introduces a regression where we forget to check same flag to unregister listeners.

Fix: 428015446
Flag: EXEMPT - ENABLE_SYS_DECORS_CALLBACKS_VIA_WM && lse_desktop_experience.ENABLE_DISPLAY_CONTENT_MODE_MANAGEMENT
Test: presubmit
Change-Id: I25bde5aeec427f4b43e5218be34fba4e26bd5f55
1 file changed