pkg/nimble/autoconn: fix conn timeout calculation
pkg/nimble/autoconn: fix conn timeout calculation

The timeout parameter for nimble_netif_connect() is given in ms
and the same is true for NIMBLE_AUTOCONN_CONN_TIMEOUT. So there
should be no conversion between the autoconn parameter and the
value passed to nimble_netif.

RIOT-OS/RIOT,miri64/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,kYc0o/RIOT,jasonatran/RIOT,jasonatran/RIOT,jasonatran/RIOT,OTAkeys/RIOT,authmillenon/RIOT,authmillenon/RIOT,OlegHahm/RIOT,jasonatran/RIOT,jasonatran/RIOT,ant9000/RIOT,authmillenon/RIOT,kYc0o/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,kYc0o/RIOT,miri64/RIOT,ant9000/RIOT,kYc0o/RIOT,kaspar030/RIOT,kaspar030/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,ant9000/RIOT,authmillenon/RIOT,kaspar030/RIOT,ant9000/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,OlegHahm/RIOT,kaspar030/RIOT,kaspar030/RIOT,miri64/RIOT,ant9000/RIOT,OlegHahm/RIOT,miri64/RIOT,OTAkeys/RIOT,miri64/RIOT