Fix cover save on form submit bug.

[seth-way]

Description

The last version would save a cover every time the user submitted one with the form. That was incorrect. Now it only saves when clicking the save cover button.

Motivation and Context

This was required in order to properly pass all iterations.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.