url: move the _generic_proxytunnel in the `has_https` block
It is only used when https exists. If you stay out of the block, pytype
complains that the type of its argument are not declared.
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}