contrib/net/http: don't set request path in Route field.

[bitterbit]

Problem

http.route tag should contain the matched route template and not the full http path. This information is not available in the http.Handler struct thus I chose to remove this line instead of fixing the function to provide this data. If users want to send full http server information (including http.route) they should probably use NewServeMux() instead of WrapHandler

[knusbaum]

LGTM. Going to try kicking the CI.