gnus-registry.el: Correct function argument order.

[gnus] / texi / splitindex

#!/bin/sh
match='M-x |(Group)|(Summary)|(Article)|(Server)|(Browse)|(Post)|(Mail)|(Score)|(Binary)|(Topic)|(Pick)'
fun='\{gnus-|\{nn.*-|\{grouplens-'
egrep "$match" gnus.idx > gnus.kidx
egrep "$fun" gnus.idx > gnus.gidx
egrep -v "$match|$fun" gnus.idx > gnus.cidx