Update Niri logo

Fix: Initial index update on empty userModel

#41

Prevent initial call to selector.userChanged() if the userModel is
empty.

Fix: Wrong value for foundUsers

Fix: Keyboard layouts under Wayland

It seems that SDDM implemented half-way support for keyboard layouts under Wayland. This prevents the theme from crashing if `shortName` is not available

Fix: Layout popup text overflowing

Update to v1.3.0

Change default value of 'background-fill-mode' to 'fill'

#35

Pack wiki

Docs: saturation option

Raise minimum requirement for SDDM version