(dev/core#2836) regen.sh - Fix incorrect reference to "flexmailer". Update data file.

[totten]

Overview

The sample data used on dev sites comes from civicrm_generated.mysql and the generator-script, regen.sh. The generator includes a filter to restrict the set of civicrm_extensions that may appear in the sample data. The list has a typo.

This is a follow-up to fix an issue with #21522. ping @eileenmcnaughton

Before

The filter matches full_name to flexmailer, which is not really the full name.

If you install a new site using sample data, then flexmailer is inactive.

After

Use the real full_name.

If you install a new site using sample data, then flexmailer is active.

[civibot]

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