Fix frontend tests

client/src/reducers/presentationReducer.test.ts

@@ -13,7 +13,10 @@ const initialState = {
   },
   activeSlideId: -1,
   code: '',
-  timer: null,
+  timer: {
+    value: null,
+    enabled: false,
+  },
 }
 
 it('should return the initial state', () => {