reduce noise in `devtools::test()`

[simonpcouch]

A whole lot of:

Warning:
`direction` should be one of `"less"`, `"left"`, `"greater"`, `"right"`, `"two-sided"`, `"both"`, `"two_sided"`, `"two sided"`, or `"two.sided"`.
---
Backtrace:
     x
  1. +-infer:::expect_doppelganger(...) at test-shade_p_value.R:48:3
  2. | \-vdiffr::expect_doppelganger(title, fig, ...) at tests/testthat/helper-data.R:5:3
  3. |   \-vdiffr (local) writer(fig, testcase, title)
  4. |     \-vdiffr:::print_plot(plot, title)
  5. +-testthat::expect_warning(...)
  6. | \-testthat:::expect_condition_matching(...)
  7. |   \-testthat:::quasi_capture(...)
  8. |     +-testthat (local) .capture(...)
  9. |     | \-base::withCallingHandlers(...)
 10. |     \-rlang::eval_bare(quo_get_expr(.quo), quo_get_env(.quo))
 11. \-ggplot2:::`+.gg`(gss_viz_both, shade_p_value(1, "aaa"))
 12.   \-ggplot2:::add_ggplot(e1, e2, e2name)
 13.     +-ggplot2::ggplot_add(object, p, objectname)
 14.     \-infer:::ggplot_add.infer_layer(object, p, objectname)
 15.       +-base::do.call(paste0(shade_fn, "_term"), args) at infer/R/visualize.R:715:5
 16.       \-infer:::shade_p_value_term(...)
 17.         \-cli::cli_warn("`direction` should be one of `\"less\"`, `\"left\"`, `\"greater\"`, \\\n         `\"right\"`, `\"two-sided\"`, `\"both\"`, `\"two_sided\"`, `\"two sided\"`, \\\n         or `\"two.sided\"`.") at infer/R/shade_p_value.R:169:8

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