Pass an encoded hex email to DEL /emails

[vbudhram]

From https://github.com/mozilla/fxa-auth-db-mysql/pull/315/files, we also need to update the auth-server delete email endpoint, to pass an encode email, similar to

fxa-auth-server/lib/db.js

Line 1069 in 45ae7b2

return this.pool.get('/email/' + hexEncode(email))

[deeptibaghel]

@vbudhram , i will do it.

[vladikoff]

👍