set mode in set_dependency()

[EmilHvitfeldt]

bug fix for tidymodels/tidymodels.org#45.

This caused the partykit classification model to think it needed censored

library(parsnip)
library(bonsai)
library(censored)

parsnip::get_model_env()$decision_tree_pkgs |>
  dplyr::filter(engine == "partykit", mode == "classification") |>
  dplyr::pull(pkg)
#> [[1]]
#> [1] "partykit" "bonsai"   "censored"

[EmilHvitfeldt]

This PR should be expanded to the entire package not just this case

[hfrick]

I checked the other engines, they were already declaring their mode 👍

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