gluon-core: reduce mac80211 fq_codel memory limit to 256KB on devices with 32MB RAM

package/gluon-core/files/etc/hotplug.d/ieee80211/01-gluon-core-codel-memusage

 #!/bin/sh
-if [ "${ACTION}" = "add" ]; then
 
+if [ "${ACTION}" = 'add' ]; then
 	RAM=$(awk '/MemTotal/ {print $2}' /proc/meminfo)
-	if [ "$RAM" -lt $((48*1024)) ]; then
-		echo "fq_memory_limit 1048576" > "/sys/kernel/debug/ieee80211/$DEVICENAME/aqm"
+	if [ "$RAM" -le $((32*1024)) ]; then
+		echo 'fq_memory_limit 262144' > "/sys/kernel/debug/ieee80211/$DEVICENAME/aqm"
 	fi
 fi