Fix typo in executorch/extension/llm/modules/_position_embeddings.py

[meta-codesync]

Reviewed By: franklinho

Differential Revision: D100957612

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• [ROCm] MI350 CI jobs will have longer queue times due to CI migration

✅ You can merge normally! (2 Unrelated Failures)

As of commit 1900b9e with merge base e7b38a3 ():

BROKEN TRUNK - The following jobs failed but were 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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