Remove extra blank line in test file

Agent-Logs-Url: https://github.com/rotu/structview/sessions/a76e014c-40c4-4051-80ca-4fb84eee5b03

Co-authored-by: rotu <119948+rotu@users.noreply.github.com>

Author: Copilot

mod_test.ts

@@ -550,7 +550,6 @@ test("bytes variable-length (no byteLength)", () => {
   })
 })
 
-
 function hexToUint8Array(hex: string): Uint8Array {
   if (hex.length % 2 !== 0) {
     throw new TypeError("Hex input must have an even length")