Fix error in attribute copying to rlm_perl

Introduced in commit c225c615760d4c907640ebd249f860d5ab3258dd. It copied the RAD_REPLY hash twice, which had the side effects that some keys dropped out.

The master branch doesn't have this problem, this is just a 3.0.x issue. The shuffle in the ordering is to keep it more in sync with master, so future merges from master are less likely to generate conflicts.