Price item issue

[Blackixx]

From https://www.spigotmc.org/threads/bossshoppro-editor.359581/:

Found an issue that needs to be rectified.
When adding an item price, it inserts
Price:
NewItem:
- 'type:STONE'
- 'amount:16'
when the correct format is:
Code (Text):
Price:
- - 'type:STONE'
- 'amount:16'