fixes broken labels for ordered lists (foliojs#1517)

Author: filecage

lib/mixins/text.js

@@ -153,12 +153,11 @@ export default {
       }
     };
 
-    const drawListItem = function(listItem) {
+    const drawListItem = function(listItem, i) {
       wrapper = new LineWrapper(this, options);
       wrapper.on('line', this._line);
 
       level = 1;
-      let i = 0;
       wrapper.once('firstLine', () => {
         let item, itemType, labelType, bodyType;
         if (options.structParent) {
@@ -225,7 +224,7 @@ export default {
 
 
     for (let i = 0; i < items.length; i++) {
-      drawListItem.call(this, items[i]);
+      drawListItem.call(this, items[i], i);
     }
 
     return this;