Modify i3blocks battery: clean shutdown and don't write to /dev/pts/*

roles/i3/files/battery

@@ -26,14 +26,11 @@ elif upower -d | grep -E 'state.+\bdischarging\b' >/dev/null 2>&1; then
     elif [ "$percent" -lt 90 ]; then
         icon="${LABEL_90}"
     fi
-    if [ "$percent" -lt "$THRESHOLD" ]; then
+    if [ "$percent" -lt 3 ]; then
+        shutdown now
+    elif [ "$percent" -lt "$THRESHOLD" ]; then
         icon="${LABEL_ALERT}"
         notify-send "CHARGE BATTERY"
-        for file in /dev/pts/*; do
-            if [ "$(ls -l "$file" | awk '{print $5}')" = '136,' ]; then
-                echo "CHARGE BATTERY" >> "$file"
-            fi
-        done
     fi
     echo "${icon} ${percent}% (${remaining})"
 else