minor cosmetics for user service

bookshop/srv/user-service.cds

@@ -1,15 +1,14 @@
 /**
  * Exposes user information
  */
-@requires : 'authenticated-user'
+@requires: 'authenticated-user'
 service UserService {
 
   /**
    * The current user
    */
-  @odata.singleton
-  entity Me {
-    ID     : String;
+  @odata.singleton entity me {
+    id     : String; // user id
     locale : String;
     tenant : String;
   }

bookshop/srv/user-service.js

@@ -1,11 +1,4 @@
-const cds = require('@sap/cds');
-
+const cds = require('@sap/cds')
 module.exports = cds.service.impl((srv) => {
-  srv.on('READ', 'Me', ({ user }) => {
-    return {
-      ID: user.id,
-      locale: user.locale,
-      tenant: user.tenant,
-    };
-  });
-});
+  srv.on('READ', 'me', ({ tenant, user, locale }) => ({ id: user.id, locale, tenant }))
+})