Revert "[ios] Fix which header is touched by swiftc wrapper script"

This reverts commit 71b78448deebb31f07681e7c531f09eaf8504b85.

Reason for revert: Bots are still complaining.

Original change's description:
> [ios] Fix which header is touched by swiftc wrapper script
>
> The CL https://crrev.com/c/5349118 added code to touch all outputs
> but incorrectly also touched one of the inputs which could cause
> the build to be considered as dirty at the end of the build.
>
> Fix the path to which header is touched, to only touch the output
> generated header, not the source bridge header.
>
> Bug: 326059372
> Change-Id: Ia2c6c81ef5006b66a7f6659affa9462559716dc4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5349222
> Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
> Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
> Reviewed-by: Federica Germinario <fedegermi@google.com>
> Cr-Commit-Position: refs/heads/main@{#1269526}

Bug: 326059372
Change-Id: I3e2544dbdab00729a379e719454b0b2de2be661e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5352906
Auto-Submit: Huiting Yu <huitingyu@google.com>
Commit-Queue: Huiting Yu <huitingyu@google.com>
Owners-Override: Huiting Yu <huitingyu@google.com>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1269565}