Move exchanging of XMPP contacts to account confirmation

Since the ejabberd service is now being enabled after the confirmation,
we also need to move the exchanging of roster contacts to that point.

app/services/create_account.rb

@@ -15,7 +15,6 @@ class CreateAccount < ApplicationService
 
     if @invitation.present?
       update_invitation(user.id)
-      exchange_xmpp_contacts if Setting.ejabberd_enabled
     end
   end
 
@@ -43,12 +42,6 @@ class CreateAccount < ApplicationService
     CreateLdapUserJob.perform_later(@username, @domain, @email, hashed_pw)
   end
 
-  def exchange_xmpp_contacts
-    #TODO enable in development when we have easy setup of ejabberd etc.
-    return if Rails.env.development?
-    XmppExchangeContactsJob.perform_later(@invitation.user, @username, @domain)
-  end
-
   def create_lndhub_account(user)
     #TODO enable in development when we have a local lndhub (mock?) API
     return if Rails.env.development?