Revert "[Autofill][Clank] Dedupe case-insensitive for card suggestions"

This reverts commit ba8435a518bb19e33ad49e03728c7bb4eebc0e09.

Reason for revert: crbug.com/370270547

Original change's description:
> [Autofill][Clank] Dedupe case-insensitive for card suggestions
>
> Update CreditCard duplicate logic to use a case-insensitive check for
> the name field, so that duplicate suggestions are not given for a local
> and server card that are the same but with different name casing.
>
> Bug: 40926090
> Change-Id: I89f1bb88317750c608330dbcc142e96cdf9a0d6c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5887348
> Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
> Commit-Queue: Nick Navarro <npnavarro@chromium.org>
> Reviewed-by: Olivia Saul <jsaul@google.com>
> Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1359960}

Bug: 40926090
Change-Id: Id82aee627e193182ad959e1ce1535f02b3d75cd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5899742
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Samar Chehade-Lepleux <samarchehade@google.com>
Owners-Override: Samar Chehade-Lepleux <samarchehade@google.com>
Cr-Commit-Position: refs/heads/main@{#1362313}