Small improvement for fade-in and fade-out sounds in Loco Roco

The fade-in and fade-out sounds in Loco Roco are way too long, this  small change improves it alot. now the sound that is played after reaching the goal in a level sounds about right.
Merge pull request #3532 from ufdada/patch-2

Small improvement for fade-in and fade-out sounds in Loco Roco