Resolve CI formatting failure in ld2450d socket JSON mapping

[Copilot]

CI was failing on cargo fmt --check due to non-rustfmt-compliant field alignment in crates/ld2450d/src/socket.rs. This PR applies the minimal formatting-only update required to restore formatter compliance.

• Formatting cleanup (crates/ld2450d/src/socket.rs)
  • Normalized spacing in TargetJson field declarations.
  • Normalized spacing in TargetJson construction inside frame_to_json.

struct TargetJson {
    x: f32,
    y: f32,
    speed: f32,
    dist: f32,
    angle: f32,
}

.map(|t| TargetJson {
    x: t.x_m(),
    y: t.y_m(),
    speed: t.speed_ms(),
    dist: t.dist_m(),
    angle: t.angle_deg(),
})

[duramson]

nice bro