fix email change tokens after 5c94ebc99a

Creating the token was relying on implicit string conversion, so tokens
were now looking like EmailAddress(****)|1ddaa4|7ba717ed6f49ad.

modules/security/src/main/EmailChange.scala

@@ -58,7 +58,7 @@ ${Mailgun.txt.serviceNote}
       case _ => none
     }
     def write(a: Option[TokenPayload]) = a ?? {
-      case TokenPayload(userId, email) => s"$userId$sep$email"
+      case TokenPayload(userId, EmailAddress(email)) => s"$userId$sep$email"
     }
   }