fix: fix lint errors

Author: filippovskii09

src/learning-header/AuthenticatedUserDropdown.test.jsx

@@ -14,7 +14,7 @@ describe('AuthenticatedUserDropdown', () => {
 
   const renderComponent = () => {
     render(
-      <AuthenticatedUserDropdown username={username} />
+      <AuthenticatedUserDropdown username={username} />,
     );
   };