oops, fix bytes vs kb disk capacity

capsulflask/shell_scripts/capacity-avaliable.sh

···
   exit 1
 fi
 
-disk_bytes_free="$(df | grep -E '/tank$' | awk '{ print $4 }')"
-if [ "$disk_bytes_free" -le $((200 * 1024 * 1024 * 1024)) ]; then
+disk_kb_free="$(df -Bk | grep -E '/tank$' | awk '{ print $4 }' | sed -E 's/[kK]//')"
+if [ "$disk_kb_free" -le $((200 * 1024 * 1024)) ]; then
   echo "VM is requesting disk when $(hostname -f) has only 200GB available."
   exit 1
 fi