style(host): blank line before the uniq comment so rustfmt is clean

dualshock4.rs left `cargo fmt --all --check` red on main (it landed with the
Windows-host DualSense work): a standalone comment placed directly after a line
ending in a trailing comment gets absorbed and re-aligned to the trailing-comment
column. A blank line before the comment block keeps rustfmt happy — and the
comment readable.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/punktfunk-host/src/inject/dualshock4.rs

@@ -258,6 +258,7 @@ impl DualShock4Pad {
         // union (uhid_create2_req) starts at byte 4.
         put_cstr(&mut ev, 4, 128, &format!("Punktfunk DualShock 4 {index}")); // name[128]
         put_cstr(&mut ev, 132, 64, &format!("punktfunk/dualshock4/{index}")); // phys[64]
+
         // A unique uniq[64] keeps the sysfs nodes tidy when several pads coexist (the kernel's
         // duplicate-device check itself keys off the per-pad MAC in the pairing feature report).
         put_cstr(&mut ev, 196, 64, &format!("punktfunk-ds4-{index}")); // uniq[64]