Fix axes direction for a floating axisartist

Author: dstansby

lib/mpl_toolkits/axisartist/axislines.py

@@ -411,7 +411,7 @@ def new_floating_axis(self, nth_coord, value,
         _helper = AxisArtistHelperRectlinear.Floating(
             axes, nth_coord, value, axis_direction)
 
-        axisline = AxisArtist(axes, _helper)
+        axisline = AxisArtist(axes, _helper, axis_direction=axis_direction)
 
         axisline.line.set_clip_on(True)
         axisline.line.set_clip_box(axisline.axes.bbox)