sys user split: first pass updating Settings

Update various places in Settings to use "admin" ueser flag
instead of checking user id "0".  This should be no-op in
single user mode since the only admin user would be user 0.
In split system user mode, this will correctly ACL admin
user instead of non-interactive system user.

Bug: 19913735
Change-Id: Ida4d59c5f689ea0dc34b3b3ff0822b087fa0afd6

src/com/android/settings/fuelgauge/PowerUsageSummary.java

@@ -201,7 +201,7 @@ public class PowerUsageSummary extends PowerUsageBase {
                         sipper.getUid() <= Process.LAST_SHARED_APPLICATION_GID) {
                     // This is a shared gid being used to do work on behalf of an app across all
                     // users. But we'll blame the power on the device OWNER.
-                    realUid = UserHandle.getUid(UserHandle.USER_OWNER,
+                    realUid = UserHandle.getUid(UserHandle.USER_SYSTEM,
                             UserHandle.getAppIdFromSharedAppGid(sipper.getUid()));
                 }