Fix Guest string was not translated in UMS.userWithName()

This CL reverts the changes made in ag/14282598 since the issue is
solved from the source and removes 'String name' parameter from
UM.createGuest() calls.

Bug: 185309160
Test: atest UserDetailsSettingsTest
Change-Id: I92acad938d79e21b45af99cc76ff411022b61f1b
Merged-In: I92acad938d79e21b45af99cc76ff411022b61f1b
(cherry picked from commit ae871ba8)