[#2676] Use single value for feature flag
[#2676] Use single value for feature flag

When enabling `rqg` flag we can use a single value `true` for
enabling/disabling

The different code-path gets enabled by:

```
insert into environment(id, "value") VALUES('rqg', 'true'::jsonb);
```

akvo/akvo-lumen,akvo/akvo-lumen