When the user returns to the "Mount point assignment" screen from the Review or Welcome screens, the "Next" button is not active until an update is made on the "Mount point assignment" screen. See the attached screencast.

Reproducible: Always

Steps to Reproduce:
1. Have a pre-installed system
2. Start a new installation
3. Select the "Mount point assignment" workflow
4. Assign all mandatory mount points
5. Proceed to the Review screen
6. Click "Back" to return to the "Mount point assignment" screen
7. Try to get to the Review screen again by clicking the "Next" button
Actual Results:  
The "Next" button is inactive. An update needs to be made on the "Mount point assignment" screen to enable the "Next" button.

Expected Results:  
Able to click the "Next" button without making any modifications on the "Mount point assignment" screen.