Remove testDisallowSetUserIcon_allowed() from CTS.

UserManager.getUserIcon() should be protected by privileged permission
MANAGE_USERS which can't be granted by CTS so that it's unable to
validate the result of DevicePolicyManager.setUserIcon().

Remove testDisallowSetUserIcon_allowed() from CTS auto test.
(Will add a manual test for setUsericon().)

Bug: 127771754
Test: Manually. There should be no testDisallowSetUserIcon_allowed in
MixedDeviceOwnerTest.

Change-Id: I4b35ef7d0ebe881a3af8fdd680c9d0ec038cd68e
2 files changed