Revert "Fix for https://surveyjs.answerdesk.io/internal/ticket/details/T5548"

This reverts commit bcb665d.

Author: Dmitry Kuzin (DevExpress)

src/select2-tagbox.js

@@ -107,23 +107,6 @@ function init(Survey, $) {
             .trigger("change");
         } else {
           $el.val(question.value).trigger("change");
-
-          if (
-            question.allowAddNewTag &&
-            $el.val().length !== question.value.length
-          ) {
-            question.value.forEach(function (choiceValue) {
-              if ($el.val().indexOf(choiceValue) === -1) {
-                var newOption = new Option(
-                  choiceValue,
-                  choiceValue,
-                  true,
-                  true
-                );
-                $el.append(newOption).trigger("change");
-              }
-            });
-          }
         }
         self.fixStyles(el);
         updateComment();