Drag and drop reordering: added necessary Tailwind classes to whitelist

[steerio]

Description

Added necessary Tailwind classes to the whitelist. It's needed for avo-pro#46.

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works

Screenshots & recording

Not applicable.

[jetienne]

@Paul-Bob Do you confirm the drag n drop feature will be part of next release?

[adrianthedev]

This is on me to review. I'm off this week. I'll try to review second half of next week.