`case_when(TRUE ~ ...)` should translate to `ELSE ...` for SQLite

[mgirlich]

It is currently translated to WHEN (1) THEN ...

library(dbplyr)
translate_sql(
  case_when(
    x == 1L ~ "yes",
    x == 0L ~ "no",
    TRUE    ~ "undefined"
  ),
  con = simulate_sqlite()
)
#> <SQL> CASE
#> WHEN (`x` = 1) THEN ('yes')
#> WHEN (`x` = 0) THEN ('no')
#> WHEN (1) THEN ('undefined')
#> END

^{Created on 2022-01-14 by the reprex package (v2.0.1)}