Update frameworks/base Emoji.java to Unicode 13.

As ICU is updated, delete special cases.

Test: atest core/tests/coretests/src/android/text/EmojiTest.java
Bug: 151964652

Change-Id: I89032c22e5464d257866d926062db34c65943572
(cherry picked from commit 31d7c155b7f58525f13c5fd1f0eae450e97c1080)
4 files changed