Remove unecessary use of blended transforms in spines.

The manual use of the blended transform breaks non-seperable custom
axes/projections. Removing this does not appear to affect any of the
spine examples.

Author: dopplershift

lib/matplotlib/spines.py

@@ -376,14 +376,7 @@ def set_position(self, position):
         self._position = position
         self._calc_offset_transform()
 
-        t = self.get_spine_transform()
-        if self.spine_type in ['left', 'right']:
-            t2 = mtransforms.blended_transform_factory(t,
-                                                       self.axes.transData)
-        elif self.spine_type in ['bottom', 'top']:
-            t2 = mtransforms.blended_transform_factory(self.axes.transData,
-                                                       t)
-        self.set_transform(t2)
+        self.set_transform(self.get_spine_transform())
 
         if self.axis is not None:
             self.axis.cla()