Approval timing issues

### Situation
* The user has not enabled their token (GEN or NEC for the respective schemes)
* The user presses the 'Enable' button on the 'Please enable' screen shown
* The panel goes into the pending state

### Issues
* Panel can return from the pending view back to the 'Please enable' screen, confusing the user
* The panel will update to post-approval view once the core blockchain polling loop returns new data.

This is due to how async operations are handled - the pending state is set when we start the TX in metamask, and stopped when that returns as done.

This can happen at a different time then the core polling loop, which checks if the user has enabled their token. If they have, it shows the post-approval view in the panel.

Perhaps ideally, we'd see if the transaction returned on the core polling loop.

As a stopgap, you could add in a call to see if the user has approved token after the metamask call, and then return pending after that.