Fix binned scaled not accepting function-limits if there are transformations

[teunbrand]

This PR aims to fix #6144.

It simply doesn't attempt to pre-transform the limits when the limits is a function.

Reprex from issue:

devtools::load_all("~/packages/ggplot2")
#> ℹ Loading ggplot2

df <- data.frame(x = seq(as.Date("2024-01-01"), as.Date("2024-06-30"), "day"))

ggplot(df) +
  geom_bar(aes(x)) +
  scale_x_binned(
    breaks = scales::breaks_width("1 month"),
    transform = scales::transform_date(),
    limits = function(x) { x }
  )
#> Warning in scale_x_binned(breaks = scales::breaks_width("1 month"), transform = scales::transform_date(), : Ignoring `n.breaks`. Use a breaks function that supports setting number of
#> breaks.

^{Created on 2024-10-18 with reprex v2.1.1}

The spurious warning the scale throws is commented upon here as well and better fixed in that PR than this PR.

[thomasp85]

LGTM