lib/pull: Only look for cookie files for non-local remotes

Just noticed this while reading an strace.

Closes: https://github.com/ostreedev/ostree/issues/1139

Closes: #1145
Approved by: jlebon

src/libostree/ostree-repo-pull.c

@@ -2743,6 +2743,7 @@ _ostree_repo_remote_new_fetcher (OstreeRepo  *self,
       _ostree_fetcher_set_proxy (fetcher, http_proxy);
   }
 
+  if (!_ostree_repo_remote_name_is_file (remote_name))
     {
       g_autofree char *cookie_file = g_strdup_printf ("%s.cookies.txt", remote_name);
       /* TODO; port away from this; a bit hard since both libsoup and libcurl