fix: Add luaJIT with lowercase name

[hyperupcall]

Summary

In the same style as 2319648, add entry with lowercase. This is the only other instance of such a case.

• Tool repo URL: N/A
• Plugin repo URL: N/A

Checklist

• Format with scripts/format.bash
• Test locally with scripts/test_plugin.bash --file plugins/<your_new_plugin_name>
• Your plugin CI tests are green
  • Tip: use the plugin_test action from asdf-actions in your plugin CI

[jthegedus]

Good catch, thanks