small refactorings and fixes

src/routes/index.js

@@ -15,7 +15,7 @@ const appPath = require("../services/app_path");
 function index(req, res) {
     const options = optionService.getOptionMap();
 
-    let view = (!utils.isElectron() && req.cookies['trilium-device'] === 'mobile')
+    const view = (!utils.isElectron() && req.cookies['trilium-device'] === 'mobile')
         ? 'mobile'
         : 'desktop';
 
@@ -47,18 +47,14 @@ function index(req, res) {
 function getThemeCssUrl(theme) {
     if (theme === 'light') {
         return false; // light theme is always loaded as baseline
-    }
-
-    if (theme === 'dark') {
+    } else if (theme === 'dark') {
         return `${assetPath}/stylesheets/theme-dark.css`;
-    }
-    else {
+    } else {
         const themeNote = attributeService.getNoteWithLabel('appTheme', theme);
 
         if (themeNote) {
             return `api/notes/download/${themeNote.noteId}`;
-        }
-        else {
+        } else {
             return false; // baseline light theme
         }
     }