Add email_level as updatable user field

assets/javascripts/discourse/lib/wizard.js.es6

@@ -46,7 +46,8 @@ const userProperties = [
   'location',
   'website',
   'bio_raw',
-  'trust_level'
+  'trust_level',
+  'email_level'
 ];
 
 const notificationLevels = [

lib/custom_wizard/mapper.rb

@@ -1,7 +1,7 @@
 class CustomWizard::Mapper
   attr_accessor :inputs, :data, :user
   
-  USER_FIELDS = ['name', 'username', 'email', 'date_of_birth', 'title', 'locale', 'trust_level']
+  USER_FIELDS = ['name', 'username', 'email', 'date_of_birth', 'title', 'locale', 'trust_level', 'email_level']
   PROFILE_FIELDS = ['location', 'website', 'bio_raw']
   
   def self.user_fields