[9.20] fix: dev: Fix swapped arguments in redirect2() single-label branch

On a recursive resolver with nxdomain-redirect configured, an
NXDOMAIN result for a query whose qname is the root could corrupt
the view's nxdomain-redirect target, after which the redirect
feature stopped working for every subsequent query in that view
until named was restarted.

Closes #5908

Backport of MR !11908

Merge branch 'backport-5908-query-redirect2-name-copy-arg-swap-9.20' into 'bind-9.20'

See merge request isc-projects/bind9!11913