DS-1479: Placeholder of the Schedules block isn't visible

[david-storm]

Issues: https://yusa.atlassian.net/browse/DS-1479 https://yusa.atlassian.net/browse/DS-1481 https://yusa.atlassian.net/browse/DS-1480

• log in as admin
• Enable the module "Y Layout Builder - Repeat Schedules"
• Create a new Landing Page (Layout Builder)
• Click to "Add a block" to a section
• Add the block called "Repeat (Group) Schedules"
• Configure as you would configure the Repeat Schedules paragraph in the old Landing Page approach
• Add the block
• Check Placeholder isn’t displayed
• Save the Landing Page (Layout Builder)
• Check the page
• Check the Register button
• click on the Set preferred location button
• Check modal