Hyprland: Start waybar early to make the systray icons appear.

Before that, waybar was started through the set-wallpaper.sh script
which was executed with an 'exec-once', but it caused nextcloud/element
to start before waybar and therefore their icon would not appear in
systray.

.config/hypr/hyprland.conf

@@ -17,6 +17,7 @@ source = ~/.config/hypr/windowrules.conf
 
 
 # Exec once
+exec-once = waybar
 exec-once = artix-pipewire-launcher restart
 exec-once = nm-applet
 exec-once = /usr/lib/polkit-gnome/polkit-gnome-authentication-agent-1