COMP: Fix -Wdeprecated-declarations using Qt::MiddleButton instead of…

… Qt::MidButton

This commit fixes warnings like the following:

  /path/to/CTK/Libs/Visualization/VTK/Widgets/ctkVTKChartView.cpp:438:30: warning: ‘Qt::MidButton’ is deprecated: MidButton is deprecated. Use MiddleButton instead [-Wdeprecated-declarations]
    438 |   if (event->button() == Qt::MidButton)
        |                              ^~~~~~~~~

Libs/DICOM/Widgets/ctkDICOMItemView.cpp

@@ -363,7 +363,7 @@ void ctkDICOMItemView::mouseMoveEvent(QMouseEvent* event){
             emit requestPreviousImage();
             d->OldMousePos = event->pos();
         }
-    }else if(event->buttons() == Qt::MidButton){
+    }else if(event->buttons() == Qt::MiddleButton){
         event->accept();
         QPoint nowPos = event->pos();
 

Libs/Visualization/VTK/Widgets/ctkVTKChartView.cpp

@@ -426,7 +426,7 @@ void ctkVTKChartView::chartBoundsToPlotBounds(double bounds[8], double plotBound
 // ----------------------------------------------------------------------------
 void ctkVTKChartView::mouseDoubleClickEvent(QMouseEvent* event)
 {
-  if (event->button() == Qt::MidButton)
+  if (event->button() == Qt::MiddleButton)
     {
     this->setAxesToChartBounds();
     }

Libs/Widgets/ctkQImageView.cpp

@@ -738,7 +738,7 @@ void ctkQImageView::mousePressEvent( QMouseEvent * event )
         d->MouseLastIntensityLevel = this->intensityLevel();
         break;
         }
-      case Qt::MidButton:
+      case Qt::MiddleButton:
         {
         d->MouseMiddleDragging = true;
         d->MouseLastX = event->x();