remove unused '_' fields in annotations full items

Author: etpinard

src/components/annotations/draw.js

@@ -250,11 +250,6 @@ function drawRaw(gd, options, index, subplotId, xa, ya) {
         var outerWidth = Math.round(annWidth + 2 * borderfull);
         var outerHeight = Math.round(annHeight + 2 * borderfull);
 
-
-        // save size in the annotation object for use by autoscale
-        options._w = annWidth;
-        options._h = annHeight;
-
         function shiftFraction(v, anchor) {
             if(anchor === 'auto') {
                 if(v < 1 / 3) anchor = 'left';