Reset http security settings to fix plug test

test/plugs/http_security_plug_test.exs

@@ -60,6 +60,8 @@ test "it does not send STS headers when disabled", %{conn: conn} do
   end
 
   test "referrer-policy header reflects configured value", %{conn: conn} do
+    Config.put([:http_security, :enabled], true)
+
     conn =
       conn
       |> get("/api/v1/instance")