🐛 fix broken editor layout in Safari (#696)
🐛 fix broken editor layout in Safari (#696)

closes https://github.com/TryGhost/Ghost/issues/8459
- use `vh` instead of `%` for editor height
kevinansfield/Ghost-Admin,acburdine/Ghost-Admin,acburdine/Ghost-Admin,TryGhost/Ghost-Admin,kevinansfield/Ghost-Admin,TryGhost/Ghost-Admin