Remove the fallback AddSupervisedUserActivity.
Rollback the changes done in ag/16388725 and ag/16709333 Bug: 209659998 Test: croot && make RunSettingsRoboTests -j40 ROBOTEST_FILTER="com.android.settings.users.UserSettingsTest" Change-Id: I75b85df50a3caff55375ad261a97225377644a38 (cherry picked from commit 86f35004) Fixes: 249057848
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