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

src/com/android/settings/users/UserDetailsSettings.java

@@ -256,7 +256,7 @@ public class UserDetailsSettings extends SettingsPreferenceFragment
 
         mSwitchUserPref.setTitle(
                 context.getString(com.android.settingslib.R.string.user_switch_to_user,
-                        UserSettings.getUserName(context, mUserInfo)));
+                        mUserInfo.name));
 
         if (mUserCaps.mDisallowSwitchUser) {
             mSwitchUserPref.setDisabledByAdmin(RestrictedLockUtilsInternal.getDeviceOwner(context));