[needs-docs] Remove duplicate Add Layer option from browser context menu

Instead of two actions: Add Layer & Add Selected Layers, just have
a single Add Selected Layers action which works on either multiple
selections or single selections

src/app/qgsbrowserdockwidget.cpp

@@ -405,8 +405,7 @@ void QgsBrowserDockWidget::showContextMenu( QPoint pt )
   }
   else if ( item->type() == QgsDataItem::Layer )
   {
-    menu->addAction( tr( "Add Layer" ), this, SLOT( addCurrentLayer() ) );
-    menu->addAction( tr( "Add Selected Layers" ), this, SLOT( addSelectedLayers() ) );
+    menu->addAction( tr( "Add Selected Layer(s)" ), this, SLOT( addSelectedLayers() ) );
     menu->addAction( tr( "Properties..." ), this, SLOT( showProperties() ) );
   }
   else if ( item->type() == QgsDataItem::Favorites )
@@ -547,11 +546,6 @@ void QgsBrowserDockWidget::addLayerAtIndex( const QModelIndex& index )
   }
 }
 
-void QgsBrowserDockWidget::addCurrentLayer()
-{
-  addLayerAtIndex( mBrowserView->currentIndex() );
-}
-
 void QgsBrowserDockWidget::addSelectedLayers()
 {
   QApplication::setOverrideCursor( Qt::WaitCursor );

src/app/qgsbrowserdockwidget.h

@@ -126,7 +126,6 @@ class APP_EXPORT QgsBrowserDockWidget : public QgsDockWidget, private Ui::QgsBro
     void setFilter();
 
     // layer menu items
-    void addCurrentLayer();
     void addSelectedLayers();
     void showProperties();
     void hideItem();