Remove redundant numeric conversion in plot_mirror_distributions test

[Copilot]

Addresses feedback on #53 regarding duplicate type conversion in test assertions.

Changes

• Removed redundant as.numeric() call in tests/testthat/test-plot_mirror_distributions.R:230 where y_labels is already converted to numeric in the pipeline

Before:

y_labels <- built$layout$panel_params[[1]]$y$get_labels() |>
  na.omit() |>
  as.numeric()
expect_true(all(as.numeric(y_labels) >= 0))

After:

y_labels <- built$layout$panel_params[[1]]$y$get_labels() |>
  na.omit() |>
  as.numeric()
expect_true(all(y_labels >= 0))

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