HLOOKUP check on the count of the rows, not columns

We must check on the count of the rows (`row_index_num` and not
`col_index_num` as in VLOOKUP) and not on the columns.

https://support.office.com/en-us/article/HLOOKUP-function-a3034eec-b719-4ba3-bb65-e1ad662ed95f

Fixes PHPOffice/PHPExcel#1339

Author: PowerKiKi

src/PhpSpreadsheet/Calculation/LookupRef.php

@@ -789,7 +789,7 @@ public static function HLOOKUP($lookup_value, $lookup_array, $index_number, $not
         }
         $f = array_keys($lookup_array);
         $firstRow = array_pop($f);
-        if ((!is_array($lookup_array[$firstRow])) || ($index_number - 1 > count($lookup_array[$firstRow]))) {
+        if ((!is_array($lookup_array[$firstRow])) || ($index_number > count($lookup_array))) {
             return Functions::REF();
         }
         $columnKeys = array_keys($lookup_array[$firstRow]);