Fix fullscreen task bounds assumption On some android devices, the task bounds may not be fullscreen by default. This CL fixes the assumption by using #getTaskBounds instead of #getTaskWidth/Height Test: atest cts/tests/framework/base/windowmanager/jetpack/src/android/server/wm/jetpack/embedding Bug: 311123689 Change-Id: I49a9562a621d117c852555163ddbc3a5ec7246fc