Fix restore from higher SDKs in SettingsBackupAgent

Actually skip the backup data for the unsupported key.

Bug: 77867300
Test: manual (adb shell bmgr restore com.android.providers.settings from
a backup set created by sdk 101)

Change-Id: I3d6a97ecbc0b048a3d07329542771f434e7e154d
1 file changed