Bug: Deletion of leading new lines in block not possible

[nsoticek]

Describe a bug: Currently in version 2.26.5 it is not possible to delete leading new lines (<br>) which can be inserted with shift+enter. Looks like this is the same issue as #726, which should already be fixed.

Steps to reproduce:

1. Try to delete the <br> in editorjs.

{
  "time": 1678038907409,
  "blocks": [
    {
      "id": "990n123EDf",
      "data": {
        "text": "A heading",
        "level": 2
      },
      "type": "header"
    },
    {
      "id": "jxsCeHKOhB",
      "data": {
        "text": "<br>You can't delete the newline above this..."
      },
      "type": "paragraph"
    }
  ],
  "version": "2.26.5"
}

Device, Browser, OS: Tested in Chrome and Edge.

Editor.js version: 2.26.5