fixed data offset for AFP waveform vis

the data itself isn't reversed, so we have to account for that

plugins/AudioFileProcessor/AudioFileProcessorWaveView.cpp

@@ -338,10 +338,12 @@ void AudioFileProcessorWaveView::updateGraph()
 	m_graph.fill(Qt::transparent);
 	QPainter p(&m_graph);
 	p.setPen(QColor(255, 255, 255));
+
+	const auto dataOffset = m_reversed ? m_sample->sampleSize() - m_to : m_from;
 
 	const auto rect = QRect{0, 0, m_graph.width(), m_graph.height()};
 	const auto waveform = SampleWaveform::Parameters{
-		m_sample->data() + m_from, static_cast<size_t>(range()), m_sample->amplification(), m_sample->reversed()};
+		m_sample->data() + dataOffset, static_cast<size_t>(range()), m_sample->amplification(), m_sample->reversed()};
 	SampleWaveform::visualize(waveform, p, rect);
 }