Revert "Disable user animations on insets whose visible frame is empty"

This reverts commit 0b9450ba.

Reason for revert:
Broke ImeInsetsControllerTest#testChangeSizeWhileControlling

Bug: 157777145
Fix: 159154994
Test: atest CtsInputMethodTestCases
Test: atest InsetsSourceConsumerTest
Change-Id: I6c47ec5f8498a3566c543d4d1d6ef62e325ccd8e