Asset loading not behaving the same when using AssetMode::Processed

## Bevy version and features

bevy 0.16.1 with the cargo feature `asset_processor`

## What you did
I used `AssetMode::Processed` mode with relative paths.

```rust
use bevy::prelude::*;

fn main() {
let mut app = App::new();

app.add_plugins(
DefaultPlugins
.set(AssetPlugin {
mode: AssetMode::Processed,
..Default::default()
})
.set(ImagePlugin::default_nearest()),
);

app.add_systems(Startup, fails);

app.run();
}

fn fails(mut commands: Commands, asset_server: Res) {
commands.spawn(Camera2d);

let face: Handle = asset_server.load("sprites/../sprites/face.png");
commands.spawn(Sprite::from_image(face));
}

```

## What went wrong

The relative path `sprites/../sprites/face.png` cannot be found, but only when using `AssetMode::Processed`.

`ERROR bevy_asset::server: Path not found: sprites/../sprites/face.png`