Fix UserRestrictionsTest#testUserRestrictions_primaryProfileOwnerOnly

Do not attempt to set restrictions that cannot be set by PO on user 0.
Add DISALLOW_CAMERA_TOGGLE and DISALLOW_MICROPHONE_TOGGLE to the list
of global restrictions settable by DO.

Bug: 188918929
Test: atest UserRestrictionsTest
Change-Id: I4ed6f62ad3fa16d1aa71812a65977446ce37b463