Remove todo for suppression handling

We do not need to handle bubble suppression on the shell side.
Bubble bar is one the displaying the bubble.
Expanded bubble should not be suppressed.

Bug: 273316505
Test: build
Flag: com.android.wm.shell.enable_bubble_bar
Change-Id: Ib92b1c4bda671933f63e9d95756500a1bf4ec42c