[Mac Text Subs] Ignore text substitutions across input type changes

When running the text substitution callback, ignore the substitution
if the text input type has changed since the callback was created
(an indication that the text substitution was meant for a different
text object).

Bug: 372217922
Change-Id: I017d44474fedf426ce2d1327e7b89ce5c28afb97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6548775
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Jayson Adams <shrike@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1460441}