Use explicit user id for setSensorPrivacy

ag/28852819 changed the user id for setSensorPrivacy from
UserHandle.USER_CURRENT to mContext.getUserId(), which always be 0 when
it's called by PhoneWindowManager. Therefore, the explicit user id needs
to be specified.

Bug: 364440865
Test: Manually press mic input keyboard button
Flag: EXEMPT bug fix
Change-Id: I4b7fab19d25d4fac71bb14a20ea0045e5a30c795