Fix unused variable warning for simple AssetV2 derives (#9961)
# Objective
Fix #9960
## Solution
Make the `visit` parameter `_visit` if there are no dependencies.
New `cargo expand` output:
```rust
pub struct Rarity {
pub name: SharedStr,
pub color: Color,
}
impl bevy::asset::Asset for Rarity {}
impl bevy::asset::VisitAssetDependencies for Rarity {
fn visit_dependencies(
&self,
_visit: &mut impl FnMut(bevy::asset::UntypedAssetId), // <-- fixed
) {}
}
impl bevy::reflect::TypePath for Rarity {
fn type_path() -> &'static str {
"myasset::item::Rarity"
}
fn short_type_path() -> &'static str {
"Rarity"
}
fn type_ident() -> Option<&'static str> {
::core::option::Option::Some("Rarity")
}
fn crate_name() -> Option<&'static str> {
::core::option::Option::Some(
"myasset::item".split(':').next().unwrap(),
)
}
fn module_path() -> Option<&'static str> {
::core::option::Option::Some("myasset::item")
}
}
```
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