bank_reconciliation: properly support payment at previous bank statement date

See merge request !1264
4 jobs for for_testrunner_2 in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.PerformanceTest-Master

00:32:30

failed ERP5.UnitTest-Master.Medusa

02:08:17

passed SlapOS.Eggs.UnitTest-Master.Python2

00:10:22

passed SlapOS.Eggs.UnitTest-Master.Python3