move plot2d (heatmap) properties panel back to the right (#866)

GUI/View/Frame/Plot2DFrame.cpp

@@ -34,12 +34,12 @@ Plot2DFrame::Plot2DFrame()
     layout->setContentsMargins(0, 0, 0, 0);
     layout->setSpacing(0);
 
+    layout->addWidget(m_intensityCanvas);
+
     layout->addWidget(m_scaleEditor);
     m_scaleEditor->setVisible(false);
     m_scaleEditor->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
 
-    layout->addWidget(m_intensityCanvas);
-
     connect(m_intensityCanvas, &IntensityDataCanvas::customContextMenuRequested, this,
             &Plot2DFrame::onContextMenuRequest);
 }