`grid_space_filling()` fails with qual parameter

[hfrick]

From running the tune tests with dev dials

library(dials)
#> Loading required package: scales

pset <- parameters(surv_dist())
grid_space_filling(pset, size = 10)
#> Error in `map()`:
#> ℹ In index: 1.
#> ℹ With name: surv_dist.
#> Caused by error in `.f()`:
#> ! `object` must be a <quant_param> object, not a <qual_param/param> object.

^{Created on 2026-04-09 with reprex v2.1.1}