Recordings persistence from 2.4 to 3.0

After an upgrade from version 2.4 to 3.0, previous recordings should still exist on the new version of BBB, but the database records are not reflecting the update. There might be a regression that needs to be corrected.

To replicate the bug:

With BBB v2.4 installed

1. Log in as admin to a Course with a BBB activity
2. Record a session. The bigbluebuttonbn_log table will look like it does in bbblogs.PNG
3. Upgrade plugin to 3.0

With BBB v3.0 installed

1. Check activity page for recordings. After cron runs, the cron log looks like it does in adhoc(2).PNG