CSharp file searches for usings after they've been removed

When a user uses Context Action to define selected usings as global, it removes them to the global file, but the current open file's been looking for usings. It needs to be re-opened to "understand" the recent updates.

<img width="971" alt="Screenshot 2023-10-26 at 22 15 40" src="https://github.com/DenisSemko/UsingLocator/assets/53062219/de1b9170-ad5b-4468-b7d9-6ecdce46e703">
