`input-slave` can't open subtitles except `.mks`

Unable to open subtitles from HTTP with the argument :sub-file=http://...

on Windows VLC is unable to open the MRL 'file:///C:/Windows/System32/%22http%3A%2F%2F...
on Linux VLC is unable to open the MRL 'file:///home/oem/http%3A//...

input-slave can't open subtitles except .mks

VLC 3.0.12, 2.2.8, 20210330-0425

Edited Mar 30, 2021 by Роман

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