S20random: use consistent whitespace

The S20random is indented with tabs, except for 3 lines.  Change
to be consistent.

Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/initscripts/init.d/S20urandom

@@ -33,9 +33,9 @@ case "$1" in
 		;;
 	stop)
 		if ! touch /etc/random-seed 2>/dev/null
-                then
-                        exit
-                fi
+		then
+			exit
+		fi
 		# Carry a random seed from shut-down to start-up;
 		# see documentation in linux/drivers/char/random.c
 		[ "$VERBOSE" != no ] && printf "Saving random seed... "