Fix getPagesToBindSynchronously returning wrong page pairs am: 62f129b878 am: 5644b4f5fa

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15754330

Change-Id: Ia7e9f4b5861e60baf7859378c3634fb5c075e7bc