Remove trackball mode

apps/opencs/view/render/previewwidget.cpp

@@ -7,7 +7,7 @@ CSVRender::PreviewWidget::PreviewWidget (CSMWorld::Data& data,
     const std::string& id, bool referenceable, QWidget *parent)
 : SceneWidget (data.getResourceSystem(), parent), mData (data), mObject(data, mRootNode, id, referenceable)
 {
-    selectNavigationMode("trackball");
+    selectNavigationMode("orbit");
 
     QAbstractItemModel *referenceables =
         mData.getTableModel (CSMWorld::UniversalId::Type_Referenceables);

apps/opencs/view/render/scenewidget.cpp

@@ -353,12 +353,6 @@ void SceneWidget::selectNavigationMode (const std::string& mode)
         mCurrentCamControl = mOrbitCamControl.get();
         mCurrentCamControl->setCamera(getCamera());
     }
-    else if (mode=="trackball")
-    {
-        mCurrentCamControl->setCamera(NULL);
-        mCurrentCamControl = mOrbitCamControl.get();
-        mCurrentCamControl->setCamera(getCamera());
-    }
 }
 
 bool SceneWidget::storeMappingSetting (const CSMPrefs::Setting *setting)