x11-wm/niri: update to 0.1.3

Manually starting from VT console now requires --session flag in order
for niri to set XDG_SESSION_TYPE and XDG_CURRENT_DESKTOP. It's passed
automatically (via niri.desktop) when using a greeter like ly or sddm.

Changes: https://github.com/YaLTeR/niri/releases/tag/v0.1.3
Reported by: GitHub (watch releases)