Close star polygons

When '*' hatching was used and you zoomed in (especially in vector
formats), the top of the star was not joined quite right. Using
closepoly as the last operation fixes this.

Author: jkseppan

lib/matplotlib/hatch.py

@@ -182,6 +182,7 @@ def __init__(self, hatch, density):
         self.shape_codes = np.full(len(self.shape_vertices), Path.LINETO,
                                    dtype=Path.code_type)
         self.shape_codes[0] = Path.MOVETO
+        self.shape_codes[-1] = Path.CLOSEPOLY
         super().__init__(hatch, density)
 
 _hatch_types = [