🐛 Fix double-scrollbar in code injection editor (#838)
🐛 Fix double-scrollbar in code injection editor (#838)

closes TryGhost/Ghost#8896
- remove `margin-right: 30px` and forced `overflow: scroll` styles for CodeMirror's "Scroll" element in the code injection editors
acburdine/Ghost-Admin,TryGhost/Ghost-Admin,kevinansfield/Ghost-Admin,kevinansfield/Ghost-Admin,acburdine/Ghost-Admin,TryGhost/Ghost-Admin