Revert "undo tabswitcher-related changes"

This reverts commit 92d0916f40.

src/components/settings_modal/helpers/vertical_tab_switcher.jsx

@@ -35,11 +35,6 @@ export default {
       type: Boolean,
       default: false,
     },
-    parentCollapsed: {
-      required: false,
-      type: Boolean,
-      default: null,
-    },
   },
   data() {
     return {
@@ -151,7 +146,6 @@ export default {
         <h2 class={headerClasses}>
           <button
             type="button"
-            class="contents"
             onClick={() => this.changeNavSide('tabs')}
             title={this.$t('nav.back')}
             class="button-unstyled"

src/components/settings_modal/settings_modal_admin_content.vue

@@ -5,7 +5,6 @@
     class="settings-admin-content settings_tab-switcher"
     :side-tab-bar="true"
     :scrollable-tabs="true"
-    :child-collapsed="false"
     :render-only-focused="true"
     :body-scroll-lock="bodyLock"
   >