format: battery block simplification

.local/bin/statusbar/sb-battery

@@ -42,10 +42,10 @@ do
 		status=""
 	else
 		case "$capacity" in
-			100|9[0-9]|8[0-9])	status="" ;;
-			7[0-9]|6[0-9])	status="" ;;
-			5[0-9]|4[0-9])	status="" ;;
-			3[0-9]|2[0-9])	status="" ;;
+			[8-9][0-9])	status="" ;;
+			[6-7][0-9])	status="" ;;
+			[4-5][0-9])	status="" ;;
+			[2-3][0-9])	status="" ;;
 			*)	status="" ; notify;;
 		esac
 	fi