本地压缩，GIF压缩的问题

[jefferyhhh]

Bug Description

A clear and concise description of what the current behavior is.
Please also add screenshots of the existing application.

Example:

设置选本地压缩，压缩等级轻度，压缩结束后显示压缩0%；

压缩等级均衡以上，gif压缩失败：

Expected behavior

完善gif压缩功能

Technical inputs

Operating System:win 10 22h2

PicSharp Version:2.27