[Media TTT] Show an undo button when a transfer has succeeded.

Screenshot of chip in light and dark mode in all states are linked in
the bug.

Bug: 203800327
Bug: 203800665
Test: `adb shell cmd statusbar media-ttt-chip-add Tablet
TRANSFER_SUCCEEDED` shows an undo button and no other commands show an
undo button.
Test: atest MediaTttControllerTest

Change-Id: I6f4343126688801f9866deed71271d55bd6bdbda