Fix incorrect dock defender banner icon.

Screenshots:
https://screenshot.googleplex.com/32YV7V6A6wxBPxc.png
https://screenshot.googleplex.com/77iMZ8CeuE5W8wE.png



Bug: 261156455
Test: Unit tests passed and manual test on the device
Change-Id: I084c9cd52a408efa3b9aeee96a0af0cae481ec79
Signed-off-by: Zhenwei Chen <zhenwec@google.com>