Contact email of existent sudt should be updated to [email protected]

[Keith-CY]

The feature of submit token info through API(#374) is going to be online and a field contact email is required when users try to update info of an existent token.

But those submitted by e-mail don't have a contact email, which blocks them being updated on the page.

Here I suggest setting all existent sudts with a contact email [email protected], the one that belongs to the project maintainer.

By doing so, the information can be updated by the maintainer without updating database directly.

[zmcNotafraid]

Finished.