wxGUI/modeler: fix screenshot size, fix src

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@48803 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/docs/wxGUI.Modeler.html

@@ -27,7 +27,7 @@ The modeler currently allows to:
 </ul>
 
 <center>
-<br><img src="wxGUI_layer_manager.jpg" border="1"><br><br>
+<br><img src="wxGUI_modeler.jpg" border="1"><br><br>
 </center>
 
 <h2>SEE ALSO</h2>