Cleanup Settings values modified after specs are run

spec/features/admin/budget_investments_spec.rb

@@ -11,8 +11,15 @@ feature 'Admin budget investments' do
 
   context "Feature flag" do
 
-    scenario 'Disabled with a feature flag' do
+    background do
       Setting['feature.budgets'] = nil
+    end
+
+    after do
+      Setting['feature.budgets'] = true
+    end
+
+    scenario 'Disabled with a feature flag' do
       expect{ visit admin_budgets_path }.to raise_exception(FeatureFlags::FeatureDisabled)
     end