Adjust memory to be approx. the same as by htop

relay/stats.sh

@@ -6,7 +6,7 @@ python=/usr/bin/python3
 cpu_usage=relay/cpu_usage.py
 # Execute python script
 cpu=$($python $cpu_usage)
-# Calculate memory usage by computing used_memory/total_memory
-mem=$(free | sed '2q;d' | awk '{print $3/$2}')
+# Calculate memory usage by computing 1 - %free_memory
+mem=$(free | sed '2q;d' | awk '{print 1 - ($4/$2)}')
 
 printf "CPU, MEM\n%f, %f\n" $cpu $mem