experimental/tools/generate-unicode-test-txt: update

No-Try: true
Change-Id: Ie904a1493570e7f2d50ab2e79c30951610641428
Reviewed-on: https://skia-review.googlesource.com/c/166802
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed