Use consistent bash5 style for conditionals and quoting

bin/omarchy-brightness-keyboard

@@ -8,13 +8,13 @@ direction="${1:-up}"
 # Find keyboard backlight device (look for *kbd_backlight* pattern in leds class).
 device=""
 for candidate in /sys/class/leds/*kbd_backlight*; do
-  if [[ -e "$candidate" ]]; then
+  if [[ -e $candidate ]]; then
     device="$(basename "$candidate")"
     break
   fi
 done
 
-if [[ -z "$device" ]]; then
+if [[ -z $device ]]; then
   echo "No keyboard backlight device found" >&2
   exit 1
 fi
@@ -24,14 +24,14 @@ max_brightness="$(brightnessctl -d "$device" max)"
 current_brightness="$(brightnessctl -d "$device" get)"
 
 # Calculate step as one unit (keyboards typically have discrete levels like 0-3).
-if [[ "$direction" == "cycle" ]]; then
+if [[ $direction == "cycle" ]]; then
   new_brightness=$(( (current_brightness + 1) % (max_brightness + 1) ))
-elif [[ "$direction" == "up" ]]; then
+elif [[ $direction == "up" ]]; then
   new_brightness=$((current_brightness + 1))
-  [[ $new_brightness -gt $max_brightness ]] && new_brightness=$max_brightness
+  (( new_brightness > max_brightness )) && new_brightness=$max_brightness
 else
   new_brightness=$((current_brightness - 1))
-  [[ $new_brightness -lt 0 ]] && new_brightness=0
+  (( new_brightness < 0 )) && new_brightness=0
 fi
 
 # Set the new brightness.