Rename field `mod::common::contexts::torrent::responses::Category::category_id` to `id` to avoid Clippy error

[josecelano]

Clippy lints: https://rust-lang.github.io/rust-clippy/master/index.html#/struct_field_names

This is the current code:

#[rustversion::stable]
#[derive(Deserialize, PartialEq, Debug)]
pub struct Category {
    pub category_id: CategoryId, // todo: rename to `id`
    pub name: String,
    pub num_torrents: u64,
}

#[rustversion::nightly]
#[derive(Deserialize, PartialEq, Debug)]
#[allow(clippy::struct_field_names)]
pub struct Category {
    pub category_id: CategoryId, // todo: rename to `id`
    pub name: String,
    pub num_torrents: u64,
}

The field category_id should not be prefixed with the struct name.

NOTICE: the frontend type is also using the same name. So It must also be refactored there.

[josecelano]

@da2ce7 told me you can use the clippy #[allow(unknown_lints)] attribute so we could have done:

#[allow(unknown_lints)]
#[derive(Deserialize, PartialEq, Debug)]
pub struct Category {
    pub category_id: CategoryId, // todo: rename to `id`
    pub name: String,
    pub num_torrents: u64,
}

We are using it on the tracker.