Change of background color for all slides is not working
Steps to reproduce:
- Create a new presentation
- Click on "Background" button
- Choose "All slides"
- Choose a color (say blue)
- The background is changed from default (grey) to blue
- Save the presentation
- Go back to the presentations list
- Click the "View the presentation" button of this presentation
- The background is still the default one (grey) instead of blue
- Click the "Edit the presentation" button
- The background is the default one instead of blue