Prepare fixture data for account sync tests (#493)

* Rename account balance field for clarity

`original_balance` and `original_currency` may infer that these values are "original" to the account.  In reality, they represent the "current" balance and currency on the account.

* Prepare fixture data for account sync testing

* Update to new field

* Fix conflicts

* Remove local schema change

test/models/account_test.rb

@@ -2,8 +2,9 @@ require "test_helper"
 
 class AccountTest < ActiveSupport::TestCase
   def setup
-    depository = Account::Depository.create!
-    @account = Account.create!(family: families(:dylan_family), name: "Explicit Checking", original_balance: 1200, accountable: depository)
+    depository = account_depositories(:checking)
+    @account = accounts(:checking)
+    @account.accountable = depository
   end
 
   test "new account should be valid" do