Windows: Fix timeouts if only endpoint 0 exists

Windows: Fix timeouts if only endpoint 0 exists

The default timeouts of 5 seconds used by WinUSB are cleared in
configure_endpoints(). This was not called if not at least one extra
endpoint apart from endpoint 0 existed, so that in those cases the
default timeout of 5 seconds remained in place.
Fix this by calling configure_endpoints, even if no interface specific
endpoints were found, so that it can configure endpoint 0.

Closes #963

Signed-off-by: Julian Scheel <julian@jusst.de>
[Tormod: Refactored to reduce duplicated code]
Signed-off-by: Tormod Volden <debian.tormod@gmail.com>