fix legend-inside by specifying xanchor to right

Author: antoinerg

_posts/plotly_js/fundamentals/legends/2015-04-09-legend-inside.html

@@ -21,6 +21,7 @@
   showlegend: true,
   legend: {
     x: 1,
+    xanchor: 'right',
     y: 1
   }
 };