For receipts issued report, specify explicit order when there's multiple financial types

The recently added optional columns are for information only and it's not possible in this format to identify which goes with which line item when it's squished into one column, and especially for aggregate receipts that might cover multiple contributions, but currently the grouping order is random. This causes problems in unit tests when it for whatever reason decides to return them in a different order, so this just specifies SOME order.