[lacros] Use non-Linux IDS_AUTOFILL_SAVE_CARD_PROMPT_TITLE_TO_CLOUD string

`chromeos` has been excluded since at least 2019. This was renamed to
`chromeos_ash` recently, but the intent is likely all Chrome OS builds,
which makes sense given the text of the two strings.

Bug: 1310269
Change-Id: I4c1a4cf1a5d5a860f35ce7ec0793f543cf1864d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3647907
Commit-Queue: Jared Saul <jsaul@google.com>
Reviewed-by: Jared Saul <jsaul@google.com>
Auto-Submit: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1003928}