Fix resource problem in PrivateVolumeForgetTest

Somehow Resource IDs are inconsistent between SettingsLib and
SettingsUnitTests. This is a workaround for NotFoundException
in SettingsUnitTests.

Bug: 183342958
Test: atest com.android.settings.deviceinfo.PrivateVolumeForgetTest
Change-Id: If513d5796d4dcd50261d9dd366f6a0def51e0ec4
1 file changed