skeleton: mod fix Clippy warning on comparison of path with non-path

[eshattow]

Compare path object with path object to resolve Clippy warning.

Error details before the fix:

error: this creates an owned instance just for comparison
--> src/skeleton/mod.rs:334:52
|
334 | .find(|manifest| manifest.relative_path == std::path::PathBuf::from("Cargo.toml"));
| --------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: try: manifest.relative_path == "Cargo.toml"
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.91.0/index.html#cmp_owned
= note: -D clippy::cmp-owned implied by -D warnings
= help: to override -D warnings add #[allow(clippy::cmp_owned)]

Note: I have no idea about Rust language or if this correct, this does make the warning go away but I am not sure if this correctly compares the path content or if it is doing something unintended like comparing objects, please review.