authentic2.postinst: fix syntax error

debian/authentic2.postinst

@@ -27,7 +27,7 @@ case "$1" in
                     $AUTHENTIC_USER
             echo "..done" >&2
         fi
-        if [ -f "/etc/$NAME/secret"]; then
+        if [ -f "/etc/$NAME/secret" ]; then
             echo "export SECRET_KEY='`</dev/urandom tr -dc [:alnum:]-_\!\%\^:\; | head -c70`'" > /etc/$NAME/secret
             chmod 0600 /etc/$NAME/secret
             chown $AUTHENTIC_USER:$AUTHENTIC_GROUP /etc/$NAME/secret
@@ -65,10 +65,4 @@ case "$1" in
         ;;
 esac
 
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
 exit 0