url: don't set appconnect time for non-ssl/non-ssh connections

url: don't set appconnect time for non-ssl/non-ssh connections

Prior to this change non-ssl/non-ssh connections that were reused set
TIMER_APPCONNECT [1]. Arguably that was incorrect since no SSL/SSH
handshake took place.

[1]: TIMER_APPCONNECT is publicly known as CURLINFO_APPCONNECT_TIME in
libcurl and %{time_appconnect} in the curl tool. It is documented as
"the time until the SSL/SSH handshake is completed".

Reported-by: Marcel Hernandez
Ref: https://github.com/curl/curl/issues/3760

Closes https://github.com/curl/curl/pull/3773