message: Refactor leadbyte_array in note_encryption tests
diff: @@ -1019,9 +1019,9 @@ mod tests {
  canopy_activation_height,
  canopy_activation_height + ZIP212_GRACE_PERIOD,
  ];
  - let leadbyte_array = [0x02, 0x03, 0x01];
  + let leadbytes = [0x02, 0x03, 0x01];
  - for (i, &height) in heights.iter().enumerate() {
  + for (_i, (&height, &leadbyte)) in heights.iter().zip(leadbytes.iter()).enumerate() {
  let (ovk, ivk, cv, cmu, epk, mut enc_ciphertext, out_ciphertext) =
  random_enc_ciphertext(height, &mut rng);
  @@ -1032,7 +1032,7 @@ mod tests {
  &epk,
  &mut enc_ciphertext,
  &out_ciphertext,
  - |pt| pt[0] = leadbyte_array[i],
  + |pt| pt[0] = leadbyte,
  );
  assert_eq!(
  try_sapling_note_decryption::<TestNetwork>(
  @@ -1196,9 +1196,9 @@ mod tests {
  canopy_activation_height,
  canopy_activation_height + ZIP212_GRACE_PERIOD,
  ];
  - let leadbyte_array = [0x02, 0x03, 0x01];
  + let leadbytes = [0x02, 0x03, 0x01];
  - for (i, &height) in heights.iter().enumerate() {
  + for (_i, (&height, &leadbyte)) in heights.iter().zip(leadbytes.iter()).enumerate() {
  let (ovk, ivk, cv, cmu, epk, mut enc_ciphertext, out_ciphertext) =
  random_enc_ciphertext(height, &mut rng);
  @@ -1209,7 +1209,7 @@ mod tests {
  &epk,
  &mut enc_ciphertext,
  &out_ciphertext,
  - |pt| pt[0] = leadbyte_array[i],
  + |pt| pt[0] = leadbyte,
  );
  assert_eq!(
  try_sapling_compact_note_decryption::<TestNetwork>(
  @@ -1466,9 +1466,9 @@ mod tests {
  canopy_activation_height,
  canopy_activation_height + ZIP212_GRACE_PERIOD,
  ];
  - let leadbyte_array = [0x02, 0x03, 0x01];
  + let leadbytes = [0x02, 0x03, 0x01];
  - for (i, &height) in heights.iter().enumerate() {
  + for (_i, (&height, &leadbyte)) in heights.iter().zip(leadbytes.iter()).enumerate() {
  let (ovk, _, cv, cmu, epk, mut enc_ciphertext, out_ciphertext) =
  random_enc_ciphertext(height, &mut rng);
  @@ -1479,7 +1479,7 @@ mod tests {
  &epk,
  &mut enc_ciphertext,
  &out_ciphertext,
  - |pt| pt[0] = leadbyte_array[i],
  + |pt| pt[0] = leadbyte,
  );
  assert_eq!(
  try_sapling_output_recovery::<TestNetwork>(
  