Revert "Add device dimension data to wallpaper backup flow"

This reverts commit 63665153.

Reason for revert: breaking wallpaper B+R as seen in b/327718094
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:3c30923b8f5703e8a32486e007eb3bb242227978)
Merged-In: Ib64b36c51384cf71cafa833df05624b1ff2d023a
Change-Id: Ib64b36c51384cf71cafa833df05624b1ff2d023a