Clock: toggle with Pos1 instead of Einfg

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

python-backend/config.yml.example

@@ -136,7 +136,7 @@ general:
   #   auto_off_minutes: 15
   #   timeout: 5.0               # seconds before a hung command is killed
 
-  # The clock overlay (Einfg on the kiosk keyboard, Guide on the remote). Optional; these
+  # The clock overlay (Pos1 on the kiosk keyboard, Guide on the remote). Optional; these
   # are the defaults. On school days a bus countdown shows for bus_lead_minutes before
   # bus_time. School days skip weekends and the school and public holidays of
   # `subdivision`, fetched daily from openholidaysapi.org and cached under