DEV instances have broken DB schemas

[orenyk]

Due to the fact that we deployed an earlier version to DEV before reverting the ordering changes (in #1697), our DEV instances currently have an extra ordering column in the equipment_models table in their db schema that isn't reflected in Rails and prevents new Equipment Models from being created. In order to fix this we should refresh all DEV databases from the current PROD instances and re-run migrations (since the offending migration has since been removed). We should also update our CHANGELOG for v6.3.0 to remove the line about equipment model ordering.