Fixes <https://issues.guix.gnu.org/52694>.
Reported by Carl Dong <contact@carldong.me>.
Use of #:re-export-and-replace would prevent upgrades from 1.2.0, whose
'source-module-closure' procedure did not recognize #:re-export-and-replace.
* guix/packages.scm: Remove #:re-export-and-replace and add top-level
call to 'module-re-export!'