make column name based on constant with strtolower

Signed-off-by: Abdul Malik Ikhsan <samsonasik@gmail.com>

src/Adapter/DbSelect.php

@@ -124,7 +124,7 @@ public function count()
 
         $this->rowCount = isset($row[self::ROW_COUNT_COLUMN_NAME])
             ? (int) $row[self::ROW_COUNT_COLUMN_NAME]
-            : (int) strtolower(self::ROW_COUNT_COLUMN_NAME);
+            : (int) $row[strtolower(self::ROW_COUNT_COLUMN_NAME)];
 
         return $this->rowCount;
     }