Align 'No widgets available' text box properly in Widget picker. am: 260c38c4a0 am: 867be835aa am: bd65752087

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14505876

Change-Id: I491d67759626158ac44074f23ce904d4bf6df4c6