Skip some BluetoothTest on private profile

Skip addUserRestriction_disallowBluetoothSharing_isNotSet on
private profile since DISALLOW_BLUETOOTH_SHARING is set on
the private profile by default.

Bug: 347619657
Test: BluetoothTest
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:85f2d01e8eef8435f267780814d6413b3d569827)
Merged-In: I9085bb8363d79673e77e321ac109ebf0d1ce2f93
Change-Id: I9085bb8363d79673e77e321ac109ebf0d1ce2f93