Save button on file manager page has insufficient color contrast

[rjkati]

Descriptive summary

On dev.nurax.samvera.org (Hyrax 5.0.1), the Save button on the File Manager page does not meet minimum WCAG AA color contrast requirements

Steps to reproduce the behavior in User Interface (UI)

1. In Chrome, download the Site Improve browser extension
2. As an admin, go to https://dev.nurax.samvera.org/concern/images/ww72bb76t/file_manager?locale=en and run the Site Improve browser extension
   

[rkuehn-uofl]

Recommend adding aria-disabled="true" to save button code - located in ~/app/views/hyrax/base/_file_manager_actions.html.erb on line 3.
Example:
<button name="button" type="submit" class="btn btn-primary disabled mr-2" data-action="save-actions" aria-disabled="true">Save</button>