Fix a minor deprecated warning about trans arg

[yutannihilation]

I see this warning.

> devtools::test(filter = "binned")
ℹ Testing ggplot2
✔ | F W  S  OK | Context
✔ |   1     15 | scale-binned                                                                                
─────────────────────────────────────────────────────────────────────────────────────────────────────────────
Warning (test-scale-binned.R:48:3): binned scales can use limits and transformations simultaneously (#6144)
The `trans` argument of `binned_scale()` is deprecated as of ggplot2 3.5.0.
i Please use the `transform` argument instead.
Backtrace:
    ▆
 1. └─ggplot2::scale_x_binned(limits = function(x) x + 1, trans = transform_log10()) at test-scale-binned.R:48:3
 2.   └─ggplot2::binned_scale(...) at ggplot2/R/scale-binned.R:34:3
 3.     └─ggplot2:::deprecate_soft0("3.5.0", "binned_scale(trans)", "binned_scale(transform)") at ggplot2/R/scale-.R:307:5
─────────────────────────────────────────────────────────────────────────────────────────────────────────────

══ Results ══════════════════════════════════════════════════════════════════════════════════════════════════
[ FAIL 0 | WARN 1 | SKIP 0 | PASS 15 ]

[teunbrand]

Looks great! Previously I tried to sneak in a fix for this too in #6007, but this is cleaner.

[yutannihilation]

Oh, I was wondering if you already addressed this, but I was too lazy to check the existing pull requests, sorry... Anyway, I'm merging this. Thanks for your review!

[teunbrand]

but I was too lazy to check the existing pull requests

No worries, I understand: they've been accummulating a little bit 😅