Fix hotseat width to span a number of columns am: 828875cd12 am: ab5faf06a8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17983445

Change-Id: I58ca8e544bb47f617190a6811b9791c535be5a33
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>