Inconsistent file extensions modal doesn't close

Overview: When a user gets the Inconsistent File Extensions modal during file upload and selects Choose other files to upload, the modal doesn't close. This is not a critical bug, just a little screen cleanup, if possible.

Steps to Reproduce:

1. Log into FOLIO-snapshot as diku_admin
2. Go to Data Import
3. Upload 2 files with different file extensions, so that you trigger the Inconsistent file extensions modal
4. Click Choose other files to upload so that a file explorer window opens

Expected Results: The Inconsistent file extensions modal should close when the file explorer window opens (similar to how it closes when you press Cancel)

Actual Results: It doesn't.

Additional Information: See attached video