SettingConfirmationHelper: Unbreak public api

Missing @hide for javadoc breaks public api.

Change-Id: I29c5e8b5b2ae5a998fdf84895808f79d1e7ae500
Signed-off-by: Evan Anderson <evan@thelinuxman.us>

Conflicts:
	core/java/android/util/SettingConfirmationHelper.java