Make QgisApp::showProgress private

Just gotta fix the canvas rendering use of this method and we can
finally remove the duplicate progress bar in the status bar...

src/app/qgisapp.h

@@ -973,7 +973,6 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
 
     void renameView();
 
-    void showProgress( int progress, int totalSteps );
     void showStatusMessage( const QString &message );
 
     void loadingLayerMessages( const QString &layerName, const QList<QgsReadWriteContext::ReadWriteMessage> &messages );
@@ -1740,6 +1739,8 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
     void endProfile();
     void functionProfile( void ( QgisApp::*fnc )(), QgisApp *instance, const QString &name );
 
+    void showProgress( int progress, int totalSteps );
+
     /**
      * This method will open a dialog so the user can select GDAL sublayers to load
      * \returns true if any items were loaded