dracut/adduser.sh: remove double whitespace from sudoers.

This lets the installer remove the anon rule from etc/sudoers.

dracut/adduser.sh

@@ -32,7 +32,7 @@ chroot ${NEWROOT} sh -c "echo "$USERNAME:voidlinux" | chpasswd -c SHA512"
 
 # Enable sudo permission by default.
 if [ -f ${NEWROOT}/etc/sudoers ]; then
-    echo "${USERNAME}  ALL=(ALL) NOPASSWD: ALL" >> ${NEWROOT}/etc/sudoers
+    echo "${USERNAME} ALL=(ALL) NOPASSWD: ALL" >> ${NEWROOT}/etc/sudoers
 fi
 
 if [ -d ${NEWROOT}/etc/polkit-1 ]; then