Do not create a UUID for the swap file

A swap file cannot be referenced by its UUID so there's no need for it to have one in the first place.

images/base.sh

@@ -12,7 +12,7 @@ function pre() {
   chmod 0700 "${MOUNT}/swap"
   fallocate -l 512M "${MOUNT}/swap/swapfile"
   chmod 0600 "${MOUNT}/swap/swapfile"
-  mkswap "${MOUNT}/swap/swapfile"
+  mkswap -U clear "${MOUNT}/swap/swapfile"
   echo -e "/swap/swapfile none swap defaults 0 0" >>"${MOUNT}/etc/fstab"
 
   arch-chroot "${MOUNT}" /usr/bin/systemd-firstboot --locale=C.UTF-8 --timezone=UTC --hostname=archlinux --keymap=us