size of REDS4 dataset

[yyhtbs-yye]

It seems that the size setting for REDS4 dataset is wrong.

mmedit->datasets->sr_reds_multiple_gt_dataset.py

    keys = [f'{i:03d}' for i in range(0, 270)]

Why it is 270 in line 58? It seems that REDS only has the folder train_sharp containing subfolders from 1 to 240.