Update Bookshelf.jsx to fix trailing spaces

Author: ragxorus

frontend/src/routes/Bookshelf.jsx

@@ -15,9 +15,9 @@ function Bookshelf({ backend, user }) {
   const [displayMode, setDisplayMode] = useState(localStorage.getItem('displayMode') || 'graph');
 
   const displayModesList = ['graph', 'list'];
-  
+
   document.title = 'Hyperglosae';
-  
+
   useEffect(() => {
     backend.getAllDocuments(user)
       .then(setDocuments);