[DOC] Fix DL classification notebook

[MatthewMiddlehurst]

What does this implement/fix? Explain your changes.

Fixes the currently breaking example notebook in the periodic tests

https://github.com/aeon-toolkit/aeon/actions/runs/10136750201/job/28025991094

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[hadifawaz1999]

ah this might be my fault with TimeCNN introduction, but weird it didnt break my PR when doing this, we sure this is the casue @MatthewMiddlehurst ?

[MatthewMiddlehurst]

It was not run by default, given the tests pass now I would say yeah this is correct.

[hadifawaz1999]

LGTM!