Remove usage of the enableBubbleBarInPersistentTaskBar flag.

Remove and merge the usage of the enableBubbleBarInPersistentTaskBar
flag to the enableBubbleBar flag.

Bug: 383181643
Flag: com.android.wm.shell.enable_bubble_bar
Test: NONE - removed and merged flag usage.
Change-Id: I4f131e1ddf8367425b91c8fb597857ee222b75d8
7 files changed