Fixed some Night Shift colours in the post settings menu
Fixed some Night Shift colours in the post settings menu

closes https://github.com/TryGhost/Ghost/issues/9244
- adjust weekday and current day text colours in the calendar popup to improve legibility
- match the new tags input colours to the other form inputs

acburdine/Ghost-Admin,kevinansfield/Ghost-Admin,TryGhost/Ghost-Admin,kevinansfield/Ghost-Admin,TryGhost/Ghost-Admin,acburdine/Ghost-Admin