Read background MTJ settings

```javascript WXAPI.mtjSettingV2() ``` ```json { "code": 0, "data": { "signGot": 0.01000000000000, "signGotFx1": 0.00500000000000, "signGotFx2": 0.00250000000000, "signGotFx3": 0.00000000000000, "transferFee": 3.00000000000000 }, "msg": "success" } ``` + signGot Sign in and get freebies + signGotFx1 Level 1 Distributor Gift + signGotFx2 Level 2 Distributor Gift + signGotFx3 Level 3 Distributor Gift + transferFee transfer fee, fill in 1 for 1%