FeatureFlags::FeatureDisabled (Feature disabled: spending_proposals)

```
F, [2019-02-19T23:50:06.314441 #93379] FATAL -- :
FeatureFlags::FeatureDisabled (Feature disabled: spending_proposals):
  app/controllers/concerns/feature_flags.rb:13:in `check_feature_flag'
  app/controllers/concerns/feature_flags.rb:7:in `block in feature_flag'`
```

Même difficulté à trouver l'origine que #91 