frontend: Sidebar story: Add missing theme redux state

Signed-off-by: Oleksandr Dubenko <[email protected]>

Author: sniok

frontend/src/components/Sidebar/Sidebar.stories.tsx

@@ -1,6 +1,7 @@
 import { configureStore } from '@reduxjs/toolkit';
 import { Meta, StoryFn } from '@storybook/react';
 import { SnackbarProvider } from 'notistack';
+import { initialState as THEME_INITIAL_STATE } from '../../components/App/themeSlice';
 import { initialState as CONFIG_INITIAL_STATE } from '../../redux/configSlice';
 import { initialState as FILTER_INITIAL_STATE } from '../../redux/filterSlice';
 import { INITIAL_STATE as UI_INITIAL_STATE } from '../../redux/reducers/ui';
@@ -29,6 +30,9 @@ const Template: StoryFn<StoryProps> = args => {
       plugins: {
         loaded: true,
       },
+      theme: {
+        ...THEME_INITIAL_STATE,
+      },
       config: {
         ...CONFIG_INITIAL_STATE,
       },