Fix indentation in %sysusers_create_compat macro (rhbz#2132835)

Automatic unindentation after <<-EOF only works with tabs. Jesus.

sysusers.generate-pre.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: true; tab-width: 4; -*-
 
 # This script turns sysuser.d files into scriptlets mandated by Fedora
 # packaging guidelines. The general idea is to define users using the
@@ -17,12 +18,12 @@ user() {
 	{ [ "$shell" = '-' ] || [ "$shell" = '' ]; } && shell=/usr/sbin/nologin
 
 	if [ "$uid" = '-' ] || [ "$uid" = '' ]; then
-        cat <<EOF
+		cat <<-EOF
 		getent passwd '$user' >/dev/null || \\
 			useradd -r -g '$group' -d '$home' -s '$shell' -c '$desc' '$user' || :
 		EOF
 	else
-        cat <<EOF
+		cat <<-EOF
 		if ! getent passwd '$user' >/dev/null; then
 			if ! getent passwd '$uid' >/dev/null; then
 			useradd -r -u '$uid' -g '$group' -d '$home' -s '$shell' -c '$desc' '$user' || :