Ensure only authorized users can set display's color transforms.

Currently, the display's color transforms are applied based on the
current user, and there are assumptions that the requesting user is the
current user. As a result, even if a non-current user attempts to set
the color transform, the current user's settings could be changed.
On devices that support 'multi-user on multiple displays', requests to
set the color transform from visible background users should not be
allowed.

(cherry-picked from https://partner-android-review.git.corp.google.com/c/platform/frameworks/base/+/2814749)

Bug: 328567508
Flag: EXEMPT bugfix (localized component, does not affect phones)
Test: atest ColorDisplayServiceTest
Change-Id: Ibac001823fbda21504ffa5c51c80a1e5daf4c080