Fix another cypress test

client/cypress/e2e/frontend/read-only/rooms.spec.js

@@ -13,10 +13,9 @@ describe('Room Team Management - Read only', () => {
       },
     },
     RoomsQuery: {
-      rooms: [
-        {
+      rooms: [{
         id: '',
-          slug: '',
+        slug: 'some-room',
         title: 'some room',
         entryCount: 3,
         appearance: 'red',
@@ -25,8 +24,7 @@ describe('Room Team Management - Read only', () => {
           id: SELECTED_CLASS_ID,
           name: 'bla',
         },
-        },
-      ],
+      }],
     },
   });