[FIX] im_livechat: bad rating=1 not 0 w/ 75d3121c

In 75d3121c9 the bad rating was change from 0 to 1.

This commit update the javascript feedback part so the behavior is the
one expected.

related to opw-1863312
closes #26043

addons/im_livechat/static/src/js/im_livechat.js

@@ -280,7 +280,7 @@ var Feedback = Widget.extend({
 
         // only display textearea if bad smiley selected
         var close_chat = false;
-        if (this.rating === 0) {
+        if (this.rating === 1) {
             this.$('.o_livechat_rating_reason').show();
         } else {
             this.$('.o_livechat_rating_reason').hide();