Fixed issue with account.rb for spam_flag to include nil by default

• Fixed:
- issue with account.rb for spam_flag to include nil by default

Was causing failure to account sign up where new values are nil and the validation failed because it expected 0,1,2 values.

app/models/account.rb

@@ -70,7 +70,7 @@ class Account < ApplicationRecord
   include DomainNormalizable
 
   SPAM_FLAG_CLASS_MAP = {
-    none: 0,
+    none: nil,
     spam: 1,
     safe: 2,
   }.freeze