REFACTOR: use tables instead of custom fields for polls (#6359)

Co-authored-by: Guo Xiang Tan <tgx_world@hotmail.com>

plugins/poll/assets/javascripts/initializers/extend-for-poll.js.es6

@@ -39,12 +39,12 @@ function initializePolls(api) {
       const polls = this.get("polls");
       if (polls) {
         this._polls = this._polls || {};
-        _.map(polls, (v, k) => {
-          const existing = this._polls[k];
+        polls.forEach(p => {
+          const existing = this._polls[p.name];
           if (existing) {
-            this._polls[k].setProperties(v);
+            this._polls[p.name].setProperties(p);
           } else {
-            this._polls[k] = Em.Object.create(v);
+            this._polls[p.name] = Em.Object.create(p);
           }
         });
         this.set("pollsObject", this._polls);
@@ -81,14 +81,11 @@ function initializePolls(api) {
       const pollName = $poll.data("poll-name");
       const poll = polls[pollName];
       if (poll) {
-        const isMultiple = poll.get("type") === "multiple";
-
         const glue = new WidgetGlue("discourse-poll", register, {
           id: `${pollName}-${post.id}`,
           post,
           poll,
-          vote: votes[pollName] || [],
-          isMultiple
+          vote: votes[pollName] || []
         });
         glue.appendTo(pollElem);
         _glued.push(glue);