splines2 steps throw empty warning if `degree` is larger than `deg_free`

[EmilHvitfeldt]

library(recipes)

recipe(~ mpg, data = mtcars) |>
  step_spline_nonnegative(mpg, deg_free = 5, degree = 6) |>
  prep() |>
  bake(new_data = NULL)
#> Warning:
#> # A tibble: 32 × 1
#>      mpg
#>    <dbl>
#>  1  21  
#>  2  21  
#>  3  22.8
#>  4  21.4
#>  5  18.7
#>  6  18.1
#>  7  14.3
#>  8  24.4
#>  9  22.8
#> 10  19.2
#> # ℹ 22 more rows

^{Created on 2023-07-23 with reprex v2.0.2}

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