fix: incorrect directory of intrinsic.rs generated. (#332) (#336)

# What ❔

Fix: incorrect directory of intrinsic.rs generated.  (#332)


change

```rust
fn update_rust_system_constants(intrinsic_gas_constants: &IntrinsicSystemGasConstants) {
    let rust_fee_constants = generate_rust_fee_constants(intrinsic_gas_constants);
    save_file(
        "core/lib/config/src/constants/fees/intrinsic.rs",
        rust_fee_constants,
    );
}
```

to

```rust
fn update_rust_system_constants(intrinsic_gas_constants: &IntrinsicSystemGasConstants) {
    let rust_fee_constants = generate_rust_fee_constants(intrinsic_gas_constants);
    save_file(
        "core/lib/constants/src/fees/intrinsic.rs",
        rust_fee_constants,
    );
}
```

## Why ❔

File `intrinsic.rs` is generated to dir `core/lib/constants/src/fees`.

## Checklist

- [x] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [x] Tests for the changes have been added / updated.
- [x] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.

core/bin/system-constants-generator/src/main.rs

@@ -210,7 +210,7 @@ fn save_file(path_in_repo: &str, content: String) {
 fn update_rust_system_constants(intrinsic_gas_constants: &IntrinsicSystemGasConstants) {
     let rust_fee_constants = generate_rust_fee_constants(intrinsic_gas_constants);
     save_file(
-        "core/lib/config/src/constants/fees/intrinsic.rs",
+        "core/lib/constants/src/fees/intrinsic.rs",
         rust_fee_constants,
     );
 }