Don't exclude system apps from disabling opt-out edge-to-edge

System apps should not opt out edge-to-edge since targeting SDK 36.

Bug: 377864165
Fix: 390076498
Flag: com.android.window.flags.disable_opt_out_edge_to_edge
Test: presubmit
Change-Id: I17ffeca015f6900f564de25a42f6a922ca6f53a0