Merged scrub and balance loops

I could not think of a good reason why I separated these, and it takes
less time if they are in the same loop, so I merged them together

usr/local/bin/btrfs-maintenance

@@ -13,27 +13,20 @@ done
 PARTITIONS=($(echo ${PARTITIONS[@]} | tr ' ' '\n' | sort -u | tr '\n' ' '))
 
 # Reallocate blocks that are less than 95% used
+# Scrub all partitions
 for i in ${PARTITIONS[@]}; do
     {
         echo "Starting balance on $i"
         btrfs balance start -dusage=95 "$i"
         echo "Finished balance on $i"
-    } &
-done
 
-# Wait for balance operations to finish
-wait
-
-# Scrub all partitions
-for i in ${PARTITIONS[@]}; do
-    {
         echo "Starting scrub on $i"
         btrfs scrub start -B "$i"
         echo "Finished scrub on $i"
     } &
 done
 
-# Wait for scrub operations to finish
+# Wait for all operations to finish
 wait
 
 exit 0