Don't remove space when going into normal mode on empty list item

[sarmong]

1. Add a list item
2. Press Enter in insert mode
3. - appears on a new line
4. Press Esc to go into normal mode
5. Space after dash is removed

Expected behaviour - space not removed.

Why? Because this is super annoying when you want to paste something into a list.

• you go to normal mode
• space is removed
• you press p
• -sometext is not a valid mardown list item syntax
• formatter concatenates this line with the previous