access log middleware: latency value is too long

[teresadq]

Describe the bug

When using access log middleware and setup ${latency}, the output value contains too many white space!!!

To Reproduce
use the code below:

	h.Use(
		accesslog.New(
			accesslog.WithFormat(`[${time}] status=${status} latency="${latency}" method=${method} path=${path} queryParams=${queryParams}`),
		),
	)

Expected behavior

we expect the output is latency="459ns". But we got latency=" 459ns".

Screenshots

Hertz version:

hertz: v0.9.3

Environment:

go version go1.23.1 linux/amd64

[xiaost]

@teresadq accesslog is NOT a part of this hertz repo.
kindly report on corresponding issue page of accesslog.