amidi: restore space between bytes

[johnkeeping]

Commit 9a8fcec ("amidi: add timestamp option for dump") removed the space between bytes when dumping MIDI, changing the output from:

90 45 40
80 45 00

to:

904540
804500

It seems that this was an unintentional side effect of refactoring the code to add the new timestamp output but the result is less readable than it was before.

Restore the space between bytes in the same message.

Fixes: 9a8fcec ("amidi: add timestamp option for dump") Signed-off-by: John Keeping [email protected]