DEV: Remove duplicated code

Fixes "overwriting computed property" warnings

app/assets/javascripts/discourse/app/controllers/tag-show.js

@@ -28,8 +28,6 @@ export default Controller.extend(BulkTopicSelection, FilterModeMixin, {
   q: null,
   showInfo: false,
 
-  categories: alias("site.categoriesList"),
-
   @discourseComputed("list", "list.draft")
   createTopicLabel(list, listDraft) {
     return listDraft ? "topic.open_draft" : "topic.create";
@@ -73,11 +71,6 @@ export default Controller.extend(BulkTopicSelection, FilterModeMixin, {
     return this.siteSettings.show_filter_by_tag;
   },
 
-  @discourseComputed("additionalTags", "category", "tag.id")
-  showToggleInfo(additionalTags, category, tagId) {
-    return !additionalTags && !category && tagId !== "none";
-  },
-
   loadMoreTopics() {
     return this.list.loadMore();
   },

app/assets/javascripts/discourse/app/templates/tags/show.hbs

@@ -21,11 +21,9 @@
           canCreateTopic=canCreateTopic
           hasDraft=draft
           createTopic=(route-action "createTopic")
-          categories=categories
           category=category
           tag=tag
           noSubcategories=noSubcategories
-          showToggleInfo=showToggleInfo
           tagNotification=tagNotification
           additionalTags=additionalTags
           showInfo=showInfo