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Terminal settings are currently stored as SYNCABLE_PREF, but since
Terminal System App only relates to Chrome OS, I believe it should
be using SYNCABLE_OS_PREF.

Change-Id: Iead464a35f0bcbf2a39ca6958073f11ad385e43c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352252Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797516}