Update lightdm-settings to 1.4.0
- Add control to choose a background-mode setting
- Background mode: Simplify setting/description of the newly added feature
- Update translations
Change these settings:
- Change Background, enable/disable grid and user background.
- Enable manual login.
- Enable automatic login.
- Change "Panel Indicators" settings, "Hostname", "Accessibility options", "Keyboard layout" and "Clock".
Reviewers: Triage Team, DataDrake
Reviewed By: Triage Team, DataDrake
Differential Revision: https://dev.getsol.us/D8867