Fix Epic sidebar toggle button icon positioning

app/assets/javascripts/vue_shared/components/sidebar/toggle_sidebar.vue

@@ -18,7 +18,7 @@
 <template>
   <button
     type="button"
-    class="btn btn-blank gutter-toggle btn-sidebar-action"
+    class="btn btn-blank gutter-toggle"
     @click="toggle"
   >
     <i

changelogs/unreleased-ee/4616-fix-sidebar-toggle-position.yml

+---
+title: Fix Epic sidebar toggle button icon positioning
+merge_request: 4138
+author:
+type: fixed

ee/app/assets/stylesheets/pages/epics.scss

-.right-sidebar.right-sidebar-collapsed .sidebar-grouped-item .gutter-toggle {
-  padding-left: auto;
-}