fix ssh config parsing for HostName

A later invocation to url.Parse() needs a preceding scheme,
otherwise the hostname just gets discarded.

Fixes #25067

Signed-off-by: Jannik Glückert <jannik.glueckert@gmail.com>
Signed-off-by: KILA <32559459+kila-star1127@users.noreply.github.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f