yn_to_tf() should function if input variable is already boolean

[kodesiba]

In spec_type_to_ds_vars() if the keep variable is already a boolean it causes a failure when attempting to build the ds_vars since yn_to_tf() is only looking for something that contains Yes/No

[kodesiba]

library(tibble)
#> Warning: package 'tibble' was built under R version 4.0.5
library(metacore)

metadoc <- list("variables" = tribble(
   ~"dataset", ~"variable", ~"order", ~"keep", ~"key_seq", ~"core",
   "DM",       "STUDYID",   1,        TRUE,    1,         "Required",
   "DM",       "DOMAIN",    1,        TRUE,    NA,        "Required",
   "DM",       "USUBJID",   1,        TRUE,    2,         "Required",
))

ds_vars <- spec_type_to_ds_vars(metadoc,
                                key_seq_sep_sheet = FALSE,
                                sheet = "variables")
#> Warning: Keep column needs to be True or False, please correct before converting
#> to a Metacore object