TS: duplicated imports in this case

Steps to Reproduce:

1.  in our sources have a TS file that uses `import { watchFile } from 'fs';`
2. somewhere begin to use `unwatchFile`
3. use quick fix to add import
4. pick "Add import from 'fs'"

=> 🐛 you get a second import

```ts
import { watchFile } from 'fs';
import { unwatchFile } from 'fs';
```
