Remove the OPL and Contrib set definition file lists from the metadata release.

The OPL and Contrib no longer contain any set definition files, so this
is not needed anymore.

Author: drgrice1

.github/workflows/bin/generate-OPL-set-def-lists.pl

@@ -48,7 +48,6 @@ jobs:
           MYSQL_PWD: opl_passwd
         run: |
           .github/workflows/bin/generate-OPL-tables.pl
-          .github/workflows/bin/generate-OPL-set-def-lists.pl
           tar czf webwork-open-problem-library-METADATA.tar.gz webwork-open-problem-library
           tar cjf webwork-open-problem-library-METADATA.tar.bz2 webwork-open-problem-library
           zip -r9 --quiet webwork-open-problem-library-METADATA.zip webwork-open-problem-library