data.Account: Exclude PrepaidVacation from "real" assets.

Same rationale as PrepaidExpenses.

conservancy_beancount/data.py

@@ -39,6 +39,7 @@ class Account(str):
         return (
             self.is_under('Assets:')
             and not self.is_under('Assets:PrepaidExpenses')
+            and not self.is_under('Assets:PrepaidVacation')
         )
 
     def is_under(self, acct_s: str) -> bool:

tests/test_data_account.py

@@ -37,6 +37,7 @@ def test_is_under(acct_name, under_arg, expected):
     ('Assets:Cash', True),
     ('Assets:Cash:EUR', True),
     ('Assets:PrepaidExpenses', False),
+    ('Assets:PrepaidVacation', False),
     ('Assets:Bank:Checking', True),
     ('Expenses:General', False),
     ('Income:Donations', False),