fix auto populate, behavior changed due MR shown below

rails/rails#48241

Also relates to change to sqlite3 adapter getting support to
'supports_insert_returning?' true

lib/arjdbc/mssql/column.rb

@@ -29,6 +29,7 @@ def unquote_string(string)
       def identity?
         sql_type.downcase.include? 'identity'
       end
+      alias_method :auto_incremented_by_db?, :identity?
 
       def ==(other)
         other.is_a?(MSSQLColumn) &&