Set BubbleBarCaptionView to the status bar color in onTaskInfoChanged.

Fallback to task background color if the status bar color is transparent. Also remove BubbleBarHandleView#setHandleInitialColor since the caption view sets the handle view color when initialized and was causing another issue with handle color when switching between bubbles.

Before: http://screencast/cast/NjA4NTM3NjEyODA1NzM0NHwxMWM0MTJmMy04Zg
After: http://screencast/cast/NTIwNzQ2NDcxMzY1MDE3NnxkNzYxZDU5Zi0xZg
Bug: 403612933
Fix: 434098805
Test: wm presubmit
Flag: com.android.wm.shell.enable_create_any_bubble
Change-Id: I0382f1ab51b2ab7d4e7be7989a36221674ca41b2