Enable compose text selection by default

Bug: b/332948216
Change-Id: I4be351fbf75e98bdb3b3006fe4b9be2397883b3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5426221


Commit-Queue: Cathy Li <chili@chromium.org>
Reviewed-by: Trevor Perrier <perrier@chromium.org>
Reviewed-by: Anthony Cui <cuianthony@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1283375}