Adding a phone number through the frontend sets TFA send method to phone

[ThomasNickerson]

When adding or changing an account's phone number in the front end, TFA method will be set to phone if it was none or email previously.

Steps to replicate:

• Log in and go to user page.
• If TFA method is phone, change it and save the change.
• Optionally log out and back in to verify TFA isn't being sent by phone.
• Edit phone number.
• Log out and back in. You should receive an SMS with a TFA code.
• Check the user page, your TFA method should now be phone. If not, check in incognito.