sway: use vanilla swaylock and fix Waybar package case

swaylock-effects is not packaged in Void; switch the lockscreen script
to vanilla swaylock and drop the unsupported --effect-blur / --fade-in
flags. Also correct the case-sensitive package name Waybar so xbps-install
can resolve it.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ansible/inventory/group_vars/void.yml

@@ -183,7 +183,7 @@ desktop_sway_packages:
   - swayfx
   - swaybg
   - swayidle
-  - swaylock-effects
+  - swaylock
   - SwayOSD
   - Waybar
   - wl-clipboard