Move email above username field.
Move email above username field.

Update user.ascx to change order of fields for user registration (#3204)
RichardHowells/Dnn.Platform,RichardHowells/Dnn.Platform,robsiera/Dnn.Platform,robsiera/Dnn.Platform,RichardHowells/Dnn.Platform,RichardHowells/Dnn.Platform,robsiera/Dnn.Platform