fix to log weight smoothing

[n-kall]

Summary

This fixes an issue in pareto smoothing log weights as the are_log_weights argument was not properly passed through

Copyright and Licensing

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[paul-buerkner]

thanks!

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if a9e3d16 is merged into master:

•   :ballot_box_with_check:as_draws_array: 101ms -> 101ms [-0.49%, +1.21%]
•   :ballot_box_with_check:as_draws_df: 32ms -> 31.9ms [-1.98%, +1.33%]
• ❗🐌as_draws_list: 187ms -> 191ms [+0.12%, +4.14%]
•   :rocket:as_draws_matrix: 30.8ms -> 29.9ms [-5.02%, -1.01%]
•   :ballot_box_with_check:as_draws_rvars: 158ms -> 158ms [-0.84%, +1.41%]
•   :ballot_box_with_check:summarise_draws_100_variables: 715ms -> 713ms [-0.61%, +0.06%]
•   :ballot_box_with_check:summarise_draws_10_variables: 79.1ms -> 79ms [-0.54%, +0.38%]
  Further explanation regarding interpretation and methodology can be found in the documentation.