fix backtrace for dynamic method

Change-Id: I3a37b5dbd063f3f92e12e3483ee08378da1c1e12
Reviewed-on: https://gerrit.instructure.com/70573
Tested-by: Jenkins
Reviewed-by: Simon Williams <simon@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>

app/models/account.rb

@@ -1092,7 +1092,7 @@ class Account < ActiveRecord::Base
     def define_special_account(key, name = nil)
       name ||= key.to_s.titleize
       self.special_account_list << key
-      instance_eval <<-RUBY
+      instance_eval <<-RUBY, __FILE__, __LINE__ + 1
         def self.#{key}(force_create = false)
           get_special_account(:#{key}, #{name.inspect}, force_create)
         end