Unable to deselect media in the media library when default image selection is chosen in content types

Problem/Motivation

Unable to deselect media in the media library when default image selection is chosen in content types.

Steps to reproduce

1. Go to a content type with field media
2. Edit the media field
3. Try to add a default image in the media field
4. Select a image from media library and now try to deselect the image.
5. You will not be able to deselect the media image.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet