[BUG] 5918 and 5919, fix missing loc/scale in TDistribution methods

[ivarzap]

Reference Issues/PRs

Fixes #5918 and fixes #5919

What does this implement/fix? Explain your changes.

Uses scale/location to compute var, pdf, log_pdf, cdf and ppf from TDistribution

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

No

What should a reviewer concentrate their feedback on?

Did you add any tests for the change?

No

Any other comments?

No

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[fkiraly]

Yes, all looks fixed now!

What would be great if you could make the same PR to skpro - we are in the middle of a refactor, but cannot take a dependency before it is released on conda. Until then, code has to be duplicated.