Merge "Add a new string for widget configuration drop target" into sc-qpr1-dev am: 52c93d17fa am: 8744e4d382 am: 138879ac3e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15992145

Change-Id: I47fe0096cb1d887873faeee737bcd6e74da00452