fix(lib/vscode): replace doStore with getSotrage

Inside the class BrowserStorageService, it looks like they replaced doStore with
getStorage.

However, at the time of writing this message, I am getting a TypeScript error
saying:
> Non-abstract class 'BrowserStorageService' does not implement inherited
> abstract member 'doStore' from class 'AbstractStorageService'.

Hopefully that will be disappear after I fix other errors.