Fixing TemperedSMC example

[ciguaran]

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Tempered SMC notebook got broken after a recent PR that change the interface, fixing it.

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[codecov]

Codecov Report

Merging #474 (ce78ae0) into main (e21fa82) will not change coverage.
The diff coverage is n/a.

❗ Current head ce78ae0 differs from pull request most recent head 0e1056d. Consider uploading reports for the commit 0e1056d to get more accurate results

@@           Coverage Diff           @@
##             main     #474   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
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  Files          48       48           
  Lines        1914     1914           
=======================================
  Hits         1898     1898           
  Misses         16       16           

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[rlouf]

LGTM, thank you for spotting and fixing this!