Fix autoscroll fail to follow the selection in "InternetView"

The cause of this issue was the missing call of the parent class
method in "InternetView::currentChanged".

Removed "InternetView::CurrentIndexChanged" signal along with
the "InternetView::currentChanged" method since it looks redundant,
the "InternetView::selectionModel" and its "currentChanged" signal
can be used instead, also it isn't used anywhere in the code.

Resolves: #4485

src/internet/core/internetview.cpp

@@ -47,11 +47,6 @@ void InternetView::contextMenuEvent(QContextMenuEvent* e) {
                                   e->globalPos());
 }
 
-void InternetView::currentChanged(const QModelIndex& current,
-                                  const QModelIndex&) {
-  emit CurrentIndexChanged(current);
-}
-
 void InternetView::setModel(QAbstractItemModel* model) {
   AutoExpandingTreeView::setModel(model);
 

src/internet/core/internetview.h

@@ -33,11 +33,7 @@ class InternetView : public AutoExpandingTreeView {
   void contextMenuEvent(QContextMenuEvent* e);
 
   // QTreeView
-  void currentChanged(const QModelIndex& current, const QModelIndex& previous);
   void setModel(QAbstractItemModel* model);
-
- signals:
-  void CurrentIndexChanged(const QModelIndex& index);
 };
 
 #endif  // INTERNET_CORE_INTERNETVIEW_H_