NotePlayHandle: fix broken note detuning feature

Commit 884b9ca671 completely broke the
note detuning feature as the detuning value was not incoorporated into
the frequency calculation anymore. Fix this by adding the detuning value
to the pitch variable.
(cherry picked from commit b30e91042b)

src/core/note_play_handle.cpp

@@ -467,8 +467,11 @@ bool notePlayHandle::operator==( const notePlayHandle & _nph ) const
 void notePlayHandle::updateFrequency()
 {
 	const float pitch =
-		( key() - m_instrumentTrack->baseNoteModel()->value() +
-				engine::getSong()->masterPitch() ) / 12.0f;
+		( key() -
+				m_instrumentTrack->baseNoteModel()->value() +
+				engine::getSong()->masterPitch() +
+				m_baseDetuning->value() )
+												 / 12.0f;
 	m_frequency = BaseFreq * powf( 2.0f, pitch +
 		m_instrumentTrack->pitchModel()->value() / ( 100 * 12.0f ) );
 	m_unpitchedFrequency = BaseFreq * powf( 2.0f, pitch );