fix(cashflow): do not filter reversals

This commit fixes the cashflow report by not filtering by reversals.  If
the reversal query is NULL, it will simply print it inline.  However,
previously the NULL killed the entire report.

This should be investigated... but at least our clients can use the
report.

server/controllers/finance/reports/cashflow/index.js

@@ -612,8 +612,6 @@ function reportByService(req, res, next) {
       JOIN service ON invoice.service_id = service.id
     WHERE cash.is_caution = 0
       AND cash.date >= DATE(?) AND cash.date <= DATE(?)
-      AND cash.uuid NOT IN
-        (SELECT DISTINCT voucher.reference_uuid FROM voucher WHERE voucher.type_id = ${CASH_RETURN_ID})
     ORDER BY cash.date;
   `;