fix shape editing

Author: alexcjohnson

src/components/shapes/draw.js

@@ -57,7 +57,7 @@ function draw(gd) {
 function drawOne(gd, index) {
     // remove the existing shape if there is one.
     // because indices can change, we need to look in all shape layers
-    gd._fullLayout._paper
+    gd._fullLayout._paperdiv
         .selectAll('.shapelayer [data-index="' + index + '"]')
         .remove();