Ui::horizontal_wrapped in bottom-up layout goes down

**Describe the bug**

When you place a `Ui::horizontal_wrapped` inside a bottom-up layout, the wrapped elements end up going down instead of up.

Here's an excerpt of the code:

```rust
ui.with_layout(egui::Layout::bottom_up(egui::Align::LEFT), |ui| {
ui.horizontal_wrapped(|ui| {
...
```

The `...` is mostly a set of buttons that I want to wrap instead of hard-breaking them into two lines.

**To Reproduce**
Steps to reproduce the behavior:

1. Create a `Ui::horizontal_wrapped` inside a bottom-up layout, as above.
2. Fiddle with the panel width to make the contents wrap.
3. Observe that the wrapped elements go down instead of up.

**Expected behavior**

Presumably, in a bottom-up layout a wrapped element would go to the line above instead of the line below.

One might argue `Ui::horizontal_wrapped` resets its layout. Even if this is the case, as best I can tell, *there is no way to achieve the behavior I want*. E.g., manually creating a `Layout` with `Layout::left_to_right(Align::Center).with_main_wrap(true)` still does not give us the ability to wrap upwards.

It appears that `Layout` needs to describe the secondary layout direction, i.e., `left_to_right` and then bottom-up on wrap.

**Screenshots**

The following short video shows the reproduction of the bug:

https://github.com/emilk/egui/assets/3129/79eb1872-da8a-46f3-adcc-f8934bce5b4e

**Desktop (please complete the following information):**
- OS: macOS
- Browser: N/A, I'm using native
- Version: 13.4

Start by tracing Ui::horizontal_wrapped and Layout::bottom_up, then reproduce the issue by resizing the panel until the contents wrap. Done means wrapped elements in a bottom-up layout move to the line above rather than below, while preserving the existing horizontal wrapping behavior.

Written by the indexing model from the issue text.