Store work lock type even it uses unified lock

If we are not storing this, LockPatternUtils.isSecure(workUserId)
will return false, and cause some methods like trySetQuietModeDisabled()
cannot show screen lock correctly.

Bug: 28738725
Change-Id: I7d0b61022b0afff2dac4cdae72d558118ea892e7
1 file changed