Get rid of unused notification_badging_enabled configuration. am: e941d72380 am: 4a24d3635e am: 2f269fa9a9

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/11959139

Change-Id: Ic1afed3a04eaf63df1385d2ee797a1bb4dba8a88