Do not set isImmersive in TaskbarDelegate

allow_gesture and immersive_mode are opposite of each other, and currently we set one or another, check one or another in different places. We should consolidate the two. Hence, we are removing all references of immersive_mode (allow_gesture has more usages).

Bug: 313033827
Test: N/A
Change-Id: I52d86c37cb39ef0bc04a04a0fa78d2b051a0e56e
1 file changed