Fix for issue LMMS#2713, adjusted Note::setKey bounds to fix one-off-…

…the-end error

src/core/Note.cpp

@@ -115,7 +115,7 @@ void Note::setPos( const MidiTime & pos )
 
 void Note::setKey( const int key )
 {
- const int k = qBound( 0, key, NumKeys );
+ const int k = qBound( 0, key, NumKeys - 1 );
  m_key = k;
 }