Migration for sortable meals/dishes causes wrong order of those

Meals:

• old order: alphabetically (was a quick fix to allow ordering at all)
• project overview: still alphabetically regardless of position
  • order by position
• ✅ meals & dishes editor: by position
• ✅ migration: position sorted alphabetically

Dishes:

• old order: default database order (row id?)
• project overview: default database order
  • order by position
• ✅ meals & dishes editor: by position
• migration: alphabetically
  • default database order