Fix double-Arc wrapping in payments benchmark under uniffi

[juliusjulyp]

benches/payments.rs fails to compile with --all-features (which enables uniffi):

error[E0308]: arguments to this function are incorrect
   --> benches/payments.rs:177:15
    |
177 |   total += send_payments(node_a, node_b).await;
    = note: expected struct `Arc<ldk_node::Node>`
               found struct `Arc<Arc<ldk_node::Node>>`

setup_two_nodes_with_store returns TestNode, which is Arc<Node> under uniffi and plain Node otherwise. The benchmark then called Arc::new(node_a) unconditionally, which is correct for the non-uniffi case but wraps an existing Arc<Node> a second time under uniffi.

Changes

Replaced Arc::new(node_x) with node_x.into() (typed as Arc<Node>). This works for both shapes without any #[cfg]: Node -> Arc<Node> via From<T> for Arc<T>, and Arc<Node> -> Arc<Node> via the reflexive From<T> for T. This is the same approach the other tests already use for NodeEntropy (.into() ).

Testing

• cargo check --bench payments --all-features (previously failed with the error above, now compiles)
• cargo check --bench payments (default features, still compiles)

[ldk-reviews-bot]

I've assigned @tnull as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

[tnull]

Thanks!