Conv1d channel last bug fix (#18258)

[rezaasjd]

Summary:

Fixes Conv1d channel las indexing issue.

Differential Revision: D97009237

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18259

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❌ 1 New Failure, 4 Pending, 3 Unrelated Failures

As of commit a1a3956 with merge base ed57040 ():

NEW FAILURE - The following job has failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-moshi-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/libs/libssh/libssh-gcrypt-4_0.9.6-2ubuntu0.22.04.6_amd64.deb 404 Not Found [IP: 185.125.190.82 80]

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[meta-codesync]

@rezaasjd has exported this pull request. If you are a Meta employee, you can view the originating Diff in D97009237.

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