Fixes the swapping of Thumbnail and Rep. Media per work (#6361).

[bwatson78]

Fixes

Fixes #6361

Summary

Fixes the swapping of Thumbnail and Representative Media per work

Guidance for testing, such as acceptance criteria or new user interface behaviors:

• Navigate to a Work that contains more than one file
• Click on the "File Manager" button
• Select radio buttons for Thumbnail and Representative Media on an image that is not currently selected
• Click on "Save" in the Toolbar
• Navigate back to the Works index page
• See that Thumbnail and Representative Media have changed
• Enter File Manager again and see that just chosen image is set as Thumbnail and Representative Media

Type of change (for release notes)

• notes-bugfix Bug Fixes
• notes-valkyrie Valkyrie Progress

Detailed Description

Previously, when attempting to change the image assigned to Thumbnail and Representative Media, the Save button wasn't being enabled by Javascript. Once that issue was fixed, clicking Save produced an error: ActionController::InvalidAuthenticityToken. This was caused by Rails needing an authenticity_token assigned to each form. That attribute was assigned in the associated form.

Changes proposed in this pull request:

• app/assets/javascripts/hyrax/file_manager/member.es6: change the JS method to on instead of trigger.
• app/views/hyrax/base/_file_manager_resource_form.html.erb: includes the requirement of an authenticity_token.

@samvera/hyrax-code-reviewers

[bwatson78]

This may be worth a backport since this fixes the same issue Emory sees in v3.4.2.