Add collapsed state for storage

The root cause of this issue is that when the folder is clicked,
the router pushed the path and the StorageItem component has been
refreshed and isOpen has been reset

- Add storing collapse state for storage
- Add tests
- Default as collapsed for fallback

fix BoostIo/Boostnote#1979 BoostIo/Boostnote#1911

browser/main/store.js

@@ -360,6 +360,12 @@ function data (state = defaultDataMap(), action) {
       state.storageMap = new Map(state.storageMap)
       state.storageMap.set(action.storage.key, action.storage)
       return state
+    case 'EXPAND_STORAGE':
+      state = Object.assign({}, state)
+      state.storageMap = new Map(state.storageMap)
+      action.storage.isOpen = action.isOpen
+      state.storageMap.set(action.storage.key, action.storage)
+      return state
   }
   return state
 }