concordance file field in not functional and should be hidden

[meven]

Describe the Bug

A clear and concise description of what the bug is.

Steps to Reproduce

In the "Table of contents, Index, Bibliograhy" dialog. You can select "Alphabetical Index" that will show concordance file.

Expected Behavior

"Alphabetical Index" or concordance file field should be hidden when it is not supported.

Actual Behavior

The user can interact with concordance file feature in a bad state.

Screenshots

Desktop

(Please complete the following information)

• Collabora version: 24.04
• Browser and version: firefox 128