Fix row/column confusion in UpdateCurrentCellOnRedim()

This function, just added in dda6aa6bdc,
inverted row and column arguments of SetCurrentCell(), resulting in
assert failures when the grid size changed.

See https://github.com/wxWidgets/wxWidgets/pull/1546

src/generic/grid.cpp

@@ -3614,7 +3614,7 @@ void wxGrid::UpdateCurrentCellOnRedim()
                 col = m_numCols - 1;
             if (row >= m_numRows)
                 row = m_numRows - 1;
-            SetCurrentCell(col, row);
+            SetCurrentCell(row, col);
         }
     }
 }