Redirects should be custom handled to avoid http to https issues with curl fallback

[Taloth]

nzbHydra redirects nzb downloads to the actual indexer, if the indexer is https and requires the curl fallback due to tls1.2. But the curl fallback isn't used coz it's originally a http url, the redirection gets handled internally by WebClient.

Since btls isn't yet reliably available we can't ditch curl, so we should disable the AutoRedirect in WebClient and do it ourselves so we can dispatch it again via the whole stack that makes the curl fallback decision.

For nzbHydra the workaround is to set nzb access type configuration to proxy mode.