"enable predicting" does not have a "cancel" button

![image](https://user-images.githubusercontent.com/1306173/54599256-8c111880-4a3a-11e9-9b28-5a388ab43ef8.png)


It is nice to have, just liek create proposal does:

![image](https://user-images.githubusercontent.com/1306173/54599317-a64af680-4a3a-11e9-858f-7fdcab398237.png)
