changed in invoice and credit note query of GSTR1 for cust_code__bil changes

- wrong cust_name display in case of CUST_CODE__BIL so done the needful changes 
  while making join with the customer master added following condition 
  WHERE customer.cust_code = (CASE WHEN trim(sot.CUST_TAX_OPT) = '1'
    THEN invoice.CUST_CODE__BIL ELSE invoice.cust_code)

git-svn-id: http://15.206.35.175/svn/proteus/business-java/trunk@195975 ce508802-f39f-4f6c-b175-0d175dae99d5