[BUG] fixed bug with distance factory 1d arrays

[chrisholder]

Reference Issues/PRs

What does this implement/fix? Explain your changes.

This PR fixes a bug where the distance factory was incorrectly handling a 1d array being passed.

Does your contribution introduce a new dependency? If yes, which one?

What should a reviewer concentrate their feedback on?

Any other comments?

PR checklist

For all contributions

• I've added myself to the list of contributors.
• Optionally, I've updated sktime's CODEOWNERS to receive notifications about future changes to these files.
• I've added unit tests and made sure they pass locally.
• The PR title starts with either [ENH], [DOC] or [BUG] indicating whether the PR topic is related to enhancement, documentation or bug

For new estimators

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[fkiraly]

Please write a PR summary. What whas the bug? What is being fixed?

[TonyBagnall]

the bug is that distance functions generated by the distance factory were not handling 1D arrays correctly by reshaping them to 2d, and this fixes it