Showing DISALLOW_OUTGOING_CALL admin dialog in the correct user.

After this change, admin dialog from Android Settings will be shown. Here is one screenshot with zh-TW locale. https://screenshot.googleplex.com/AVtwtD7sEfSij5W
Note: the alert message could be modified by device owner. On Retail Demo devices, the message is "This change isn't allowed on retail demo devices."

See b/286361977#comment4 for detailed explaination.

Bug: 286361977
Change-Id: If91d0e10ba28441aed8dd1f7591b21e25cdad553
Test: manual