Merge "Correct # of cells estimation that can fit horizontally in widgets picker" into sc-v2-dev am: c352b92aff

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15188773

Change-Id: Ib2051e781e7ad7ef77f67d2c2a0cd9dafec3c931