Update setting taskbar window height

Updated the logic to set the taskbar window height to accommodate the
bubble bar with its maximum flyout height before the bubble bar
animation begins. The height is reverted to the default value once the
animation is completed.

Fixes: 378400160
Flag: com.android.wm.shell.enable_bubble_bar
Test: Manual. Set 3-button navigation mode and have the QSB placed
above the hotseat. Send a notification that will display a bubble, and
observe the bubble bar animation and final placement aligned with the
QSB.
Next, set gesture navigation mode and repeat the flow above. Observe
that the bubble bar is aligned with the hotseat icons.
Felix video:
http://recall/-/gx8ASgewUeUS3QYohfrd1J/gYMVt0sH4si0KOpaBxIPem
Tangor video:
http://recall/-/gx8ASgewUeUS3QYohfrd1J/fz95MbjcjW3awStnuOl8BJ

Change-Id: I239f935743c3936fed44822c3c62652073ffefe2