Fixed BNP.canCurrentUserBlockUsers()

BNP was designed to run under user 0 (system), which on phones is the primary user.

But on automotive, user 0 is "headless", and the primary user is the first "human" user.

Test: manual verification on automotive
Test: atest CtsHostsideNumberBlockingTestCases #  on auto and walleye

Fixes: 139484721
Bug: 139551240
Bug: 139551257

Change-Id: I3dfeabc4b3f926b84308b221e5d59ed73c77b5ff
1 file changed