Update ReplaceConvWithChannelLastConvPass and MakeSliceAndCatDimOutermostPass to correctly set modified bit

[DrJessop]

Summary: As titled

Differential Revision: D87880891

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16185

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❌ 1 New Failure, 1 Cancelled Job, 3 Unrelated Failures

As of commit 951f8ca with merge base 1fbf951 ():

NEW FAILURE - The following job has failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t e8124e401de3367a9149ef8824a76f0045b1f08acabacab96aab7daf0dc09cc9 /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-setup-linux-gcc / linux-job (gh)

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (similar failure)
  ##[error]The operation was canceled.

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

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

• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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[meta-codesync]

@DrJessop has exported this pull request. If you are a Meta employee, you can view the originating Diff in D87880891.

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