notifications: Invert the "Do not disturb" switch
The switch is binded to the "show-banners" gsetting. When DnD is ON, users don't want banners, therefore "show-banners" is OFF.
For this reason we need to invert the switch.
Fixes #878 (closed)
The switch is binded to the "show-banners" gsetting. When DnD is ON, users don't want banners, therefore "show-banners" is OFF.
For this reason we need to invert the switch.
Fixes #878 (closed)