3.5.1 — Looking for Game config fixes

Fixed

• The Looking for Game config page silently discarded every save on the live bot. The lfg plugin row was missing from the production database (seeds only ran when the database was first created), so saves returned 404 and the page reloaded with nothing persisted. Plugin seeding now runs on every boot. (#208)
• The minimum-membership-age fields on the Looking for Game config page showed the browser's default spinner arrows instead of the site's +/- stepper controls. (#208)