Allow Shape Dividers to be Saved As Reusable Parts

[ThomasBrightVessel]

When trying to make a shape divider reusable on several pages it doesn't work. When saved as a Reusable and then added to a page it doesn't render. I also tried not making it reusable and adding a class to it where I can then set up the settings but the "Divider Shape" field isn't saved into the class.

Steps to reproduce the behavior (with reusable):

1. Create a shape divider
2. Save as Reusable
3. Go to another page
4. Add the Reusable block
5. Save and go to frontend

Steps to reproduce the behavior (with class):

1. Create a shape divider
2. Add a custom class
3. Edit the "Divider Shape" field
4. Go to another page
5. Add a shape divider and apply the class