[BUG] make metric precomputed in distances sklearn tests

[TonyBagnall]

Reference Issues/PRs

See #1189 (fixes it I think, @MatthewMiddlehurst)

Sets kernel to precomputed in SVM distance test for pairwise.

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[MatthewMiddlehurst]

I think the KNN test also has the same issue.

It would be good to test predict with a different dataset and n_cases IMO.

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[TonyBagnall]

I think the KNN test also has the same issue.

It would be good to test predict with a different dataset and n_cases IMO.

changed them round, take a look

[MatthewMiddlehurst]

LGTM