Don't animate the power button dialog when swiping up dismiss shade

This CL prevents the power button dialog to not animate back into the
power button when the dialog is dismissed because the user swiped up to
dismiss the shade. This behavior is already on by default for all
SystemUIDialogs [1], but this shared behavior was disabled for the power
button dialog in particular [2] because the dismiss/broadcast logic is
slightly different for that dialog.

See http://b/268510470#comment7 for before/after videos.

[1] http://shortn/_K9azAzlqiZ
[2] http://shortn/_EOds67Obsp

Bug: 268510470
Test: Swipe up from the bottom of phone when the power button dialog is
shown from the power button.

Change-Id: Ic3ec4e91fba21e8f0c31bbc7c33f04dee7ef821b