Merge "Rename first page pinned widget to mFirstPagePinnedWidget" into tm-qpr-dev am: f748755a4f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/20227193

Change-Id: I4063cd9de96fbf2b1e29c1461f601d34f0c93a0c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>