thinkpads: fix polybar battery module for t480

hosts/thinkpads/polybar.nix

@@ -15,7 +15,11 @@ in with theme.colors;
     };
     "module/battery" = {
       type = "internal/battery";
-      battery = "BAT0";
+      # battery = "BAT0";
+      # TODO: either separate t480 config or decomission old ThinkPads
+      # This battery parameter is different between them
+      # Use `ls -1 /sys/class/power_supply/` to check available power devices
+      battery = "BAT1";
       adapter = "AC";
 
       format-low = "<animation-low> <label-low>";