add activate function properly

While the previous function technically worked, the connections
weren't setup properly. Also the row_count function wasn't running
because it requires a QModelIndex parameter. Added a simple count
function to make sure we know how many slides there are in QML.

src/qml/presenter/MainWindow.qml

@@ -15,7 +15,7 @@ Controls.Page {
     property int currentServiceItem
     property int currentSlide
     property int totalServiceItems: ServiceItemModel.rowCount()
-    property int totalSlides: SlideMod.rowCount()
+    property int totalSlides: SlideMod.count()
     property url imageBackground: presentation.imageBackground
     property url videoBackground: presentation.vidBackground
     property string currentText: presentation.text

src/qml/presenter/Presentation.qml

@@ -365,6 +365,7 @@ FocusScope {
     function nextSlideAction() {
         keyHandler.forceActiveFocus();
         console.log(currentServiceItem);
+        console.log(totalSlides);
         const nextSlideIdx = currentSlide + 1;
         if (nextSlideIdx > totalSlides || nextSlideIdx < 0)
             return;

src/qml/presenter/PreviewSlideListDelegate.qml

@@ -71,7 +71,7 @@ Item {
 
 
     Connections {
-        target: SlideModel
+        target: SlideMod
         function onDataChanged() {
             if (active) {
                 previewSlidesList.currentIndex = index;