fix downsample bug in MidResTemporalBlock1D

[holmosaint]

What does this PR do?

Fixes # (issue)

Before submitting

• [✅] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• [✅] Was this discussed/approved via a GitHub issue or the forum? Please add a link to it if that's the case: Downsample in the MidResTemporalBlock1D #10247
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[a-r-r-o-w]

thanks!