Separate 'jubeat.dll' and 'music_db.dll'

[ghost]

and add "Unlock all songs" for 2020120801, 2020072701

[mon]

There's a little indent problem (tabs vs spaces) but it's only 1 line, so it's OK.

[ghost]

There was no problem in the editor, but I checked it after the correction was completed and revised further. thanks!