[IX] Improve modal behavior

[Zasa-san]

Split from https://github.com/huridocs/uwazi/issues/6583#issuecomment-2148469630

We should adjust the new IX modal for extractors to behave as expected when editing an extractor:

• Should start with the 'Selected' checkbox checked.
• Should show groups with selected items open.
• Should apply the 'Selected' filter.