Fix issue whereby toggling the 'Move selected to top' action in the a…

…ttribute table dialog

breaks the current sort column and sort order due to the column and order being
hard-coded to 0 and Qt::AscendingOrder respectively.

src/gui/attributetable/qgsattributetablefiltermodel.cpp

@@ -281,7 +281,7 @@ void QgsAttributeTableFilterModel::setSelectedOnTop( bool selectedOnTop )
     if ( order != Qt::AscendingOrder && order != Qt::DescendingOrder )
       order = Qt::AscendingOrder;
 
-    sort( 0, Qt::AscendingOrder );
+    sort( column, order );
     invalidate();
   }
 }