Additional plugin check fixes

[brianhogg]

Description

Additional fixes reported by the plugin checker.

How has this been tested?

Manually.

Checklist:

• [ ] This PR requires and contains at least one changelog file. <!-- To create a changelog yml file: npm run dev changelog add -- -i and follow the prompt. See also: https://github.com/gocodebox/lifterlms/blob/trunk/packages/dev/README.md#changelog-add -->
• [ ] My code has been tested.
• [ ] My code passes all existing automated tests.
• [ ] My code follows the LifterLMS Coding & Documentation Standards.

[brianhogg]

No changelog since dev has one from fix/plugin-checks already.