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/family_test.rb

@@ -6,12 +6,12 @@ class FamilyTest < ActiveSupport::TestCase
   end
 
   test "should have many users" do
-    assert_equal 2, @dylan_family.users.size
-    assert @dylan_family.users.include?(users(:bob))
+    assert @dylan_family.users.size > 0
+    assert @dylan_family.users.include?(users(:family_admin))
   end
 
   test "should have many accounts" do
-    assert_equal 2, @dylan_family.accounts.size
+    assert @dylan_family.accounts.size > 0
   end
 
   test "should destroy dependent users" do