CLN: Remove duplicate code line

Author: nrebena

pandas/plotting/_matplotlib/core.py

@@ -1393,11 +1393,10 @@ def _make_plot(self):
             if self.orientation == "vertical":
                 ax.xaxis.update_units(self.ax_index)
                 self.tick_pos = ax.convert_xunits(self.ax_index).astype(np.int)
-                self.ax_pos = self.tick_pos - self.tickoffset
             elif self.orientation == "horizontal":
                 ax.yaxis.update_units(self.ax_index)
                 self.tick_pos = ax.convert_yunits(self.ax_index).astype(np.int)
-                self.ax_pos = self.tick_pos - self.tickoffset
+            self.ax_pos = self.tick_pos - self.tickoffset
 
             kwds = self.kwds.copy()
             if self._is_series: