[BUG]: Uid format in preprocessors/popbutfy.py may be incorrect

[Nugine]

Describe the bug

Found by linter scanning

$ ruff check --select F523
preprocessors/popbutfy.py:104:28: F523 [*] `.format` call has unused arguments at position(s): 2
Found 1 error.
[*] 1 fixable with the `--fix` option.

Amphion/preprocessors/popbutfy.py

Line 104 in d335514

"Uid": "{}#{}#".format(singer, chosen_song, chosen_uid),

Amphion/preprocessors/popbutfy.py

Lines 100 to 105 in d335514

	res = {
	"Dataset": "popbutfy",
	"Singer": singer,
	"Song": chosen_song,
	"Uid": "{}#{}#".format(singer, chosen_song, chosen_uid),
	}

[RMSnow]

Hi @Nugine, thanks a lot! We will patch it soon (cc @Adorable-Qin )