Move interpretation of OSTREE_DEBUG_HTTP

It makes more sense to have this in flatpak_create_soup_session() so
every caller of that interprets the env var.

Closes: #2740
Approved by: matthiasclasen
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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