[Feature]: Improve and fix absolute dragMode

### GrapesJS version

- [X] I confirm to use the latest version of GrapesJS

### What browser are you using?

Chrome v93

### Reproducible demo link

https://codepen.io/damnslow/pen/yLXXOxQ

### Describe the bug

**How to reproduce the bug?**
1. Select both the elements
2. Drag using drag icon

**What is the expected behavior?**
Both elements should move together

**What is the current behavior?**
Only one element moves.

If is necessary to execute some code in order to reproduce the bug, paste it here below:
No.

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct