cli: don't override existing seeding scope in `rad clone` — heartwood

If I’m already seeding a repository, rad clone without an explicit --scope should not change the scope of the existing seeding policy.

 use radicle::git::raw;
 use radicle::identity::doc;
 use radicle::identity::doc::RepoId;
 use radicle::node;
 use radicle::node::policy::Scope;
 use radicle::node::{self, policy};
 use radicle::node::{Handle as _, Node};
 use radicle::prelude::*;
 use radicle::rad;

     NoSeeds(RepoId),
     #[error("fetch: {0}")]
     Fetch(#[from] sync::FetchError),
     #[error("policy store: {0}")]
     PolicyStore(#[from] policy::store::Error),
 }
 struct Checkout {

 fn clone(
     id: RepoId,
     directory: Option<PathBuf>,
     scope: Scope,
     scope: Option<Scope>,
     settings: SyncSettings,
     node: &mut Node,
     profile: &Profile,
     bare: bool,
 ) -> Result<CloneResult, CloneError> {
     let scope = match scope {
         Some(scope) => scope,
         None => profile
             .policies()?
             .seed_policy(&id)?
             .scope()
             .unwrap_or(Scope::Followed),
     };
     // Seed repository.
     if node.seed(id, scope)? {
         term::success!(

     /// Follow scope
     #[arg(
         long,
         default_value_t = Scope::Followed,
         value_parser = terminal::args::ScopeParser
     )]
     pub(super) scope: Scope,
     pub(super) scope: Option<Scope>,
     #[clap(flatten)]
     pub(super) sync: SyncArgs,